When it comes to VST synths, you can decide on whether you want to buy one, or you want to download one for free. Naturally, the best VST synths are really the one that you’re gonna have to buy. But there are a few gems out there that are for free.
Best VST Free Instrument Plugins As noted, down below are ten of our favorite free VST (or audio plug-in) on synthesizers and samplers. If you’re a beginner or want to learn how to use these products, then you should definitely consider some of these free variations. Link to the VST: to the 'Autumn Leaves' backing track: https://www.youtube.com/watch?v=cawcLKFhFMA. Best Free VST Plugins 1. Native Instruments. Native Instruments has done a remarkable job by releasing KOMPLETE START. It’s a complete audio-mixing bundle that contains a variety of VST plugins, virtual instruments, thousands of audio effects, and several other free resources for music production. Earlier all these elements were available.
However, there are so many “free VST synths” that downloading them all and installing them on your computer and DAW can be too time consuming.
So for this article, we’ve researched and compiled ten of the best free VST synths. That’ll eliminate a lot of trial and error for you.
Interested in seeing what they are? Keep reading…
The 10 Best Free VST Synths to Use
Check out these other studio and music production gear:
# 1 – Synth1 by Ichiro Toda
If there is one free VST synth that you want to get yourself familiar with, it is the Synth1 by Ichiro Toda. This synthesizer is actually a favorite among many music producers, and is often the one that’s most recommended.
Synth1 is an analog modeled subtractive synthesizer. It’s functions are modeled on the Clavia Nord Lead 2 Red Synth.
It features 2 oscillators, which can be modulated via FM, ring, synchronized, modulation envelopes. Using the 4 types of filters, you can sculpt some cool and interesting sounds, adding distortion for effects.
It has 2 LFOs, an arpeggiator, and tempo delay. These functions are synchronized with the host digital audio workstation’s BPM.
As far as effects goes, you get the ability to add stereo chorus and flangers.
In writing notes, you have legato mode as well as portamento for interesting slides, yet the ability to play up to 16 notes polyphony.
You have a total of 128 presets, and its controls can be automated.
Synth1 was optimized for light CPU load using SSE instructions. Definitely the first choice in “freeware” soft synthesizers.
Demonstration
# 2 – FireBird 2 by Tone2
After Synth1 we have FireBird, a synthesizer that was actually premium synth you had to BUY until the developers at Tone2 decided to release it for the masses after 15 years of development.
Tone2 is responsible for some of the best VST synthesizers on the market, many of which are used to create chart topping hits, FireBird 2 is one of them. So this is definitely recommended for your collection.
FireBird 2 is a subtractive synthesizer with a very intuitive and easy to use interface to navigate its 437 preset sounds. That’s a lot of presets for a free VST synth…
FireBird 2 features Harmonic Content Morphing, which utilizes a large range of standard waveforms that can emulate the sound of many instruments, acoustic or synthetic (kind of like wavetable synthesis).
The synth comes with 38 types of filters, including your standard low-pass filters, comb-filtering, EQ, Phaser, Vocal filters, plus FM and AM modulation, to name a few. It also comes with an arpeggiator, so no need to use an external arpeggiator with this device.
You can also customize its look as it has several skins you can download or create to change the interface.
Overall, another very good synthesizer to use, which has been used commercially on chart topping hits.
Demonstration
# 3 – Crystal by GreenOak
If you want a synthesizer programmed by the same person that made Omnisphere, one of the titanic synths in existence today, look no further than the Crystal by GreenOak.
This synthesizer is unique also because it’s available for iPhone. There are many user reviews talking about how great this synth works as a possible free alternative to Omnisphere (there’s another alternative below as well). Of course, don’t expect the same power, nor does it come with any samples.
However, that less power means it won’t be a resource hog on your computer (something Omnisphere is known to be). And you can find free and paid for soundfonts (.sfz files) all over the internet.
In terms of features, it’s credited as utilizing both subtractive synthesis as well as FM synthesis technologies. It’s modulation controls offers 90 parameters, multi-stage envelopes, tempo sync, delays, built-in effects for chorus, flanger, filters, echoes. It has everything you’d need in a synthesizer, which is great for someone learning. You can also use automation, as MIDI controls.
Overall, another good option for a free synthesizer.
# 4 – TAL-NoiseMaker by TOGU Audio Line
Next on the list we have TAL-NoiseMaker by TOGU Audio Line. We came across this synth because it was actually recommended (along with Synth1) as one out of two best free vst synth to use by a professor on synthesis. Mainly because it consists of all the aspects of synthesis that you need to be familiar with, as a beginner, plus its ease of use.
Looking at this synth, you can see why. Everything is laid of clearly, you don’t have to searching around too much for controls that you need when designing a sound.
This actual version was designed as an improved version of TAL-Elek7ro, which comes with an entirely new synth engine, with a few effects like reverb, chorus, low pass filter, and a bit crusher. You also get ring modulation as a synch-able triangle.
The ADSR is very suitable for slow pads or fast envelops attacks. It comes with 128 factory presents, 80 of which were designed by Frank “Xenox” Neumann.
It total, you receive 3 Oscillators, which can each be programmed individually for phase modulation, frequency modulation, or to generate sawtooth, pulse, noise, triangle, sine, square, or rectangle waves.
You get up to 6 voices, which is not a lot but not bad, which can be played in legato, portamento, or polyphonic.
All knobs can be learned via MIDI and automated within your DAW.
Overall, considered an incredible synth, chock full of features, and won’t disappoint as freeware plugin device.
Demonstration
# 5 – Dexed by Digital Suburban
Dexed by Digital Suburban This is a dedicated FM synthesizer, which is excellent for those looking for a frequency modulation synthesizer either to learn, or to general specific sounds. It’s actually designed based on the Yamaha DX7.
This soft synth was created for the intention of being a tool or companion to the original Yamaha synthesizer, particularly for those studying FM synthesis. However, it can be the go-to free synthesizer for those wanting to make some vintage sound genres like Synthwave, which were created using the vintages synths of the day like Yamaha DX7.
Many have considered it an improvement on the actual Yamaha model, plus it being lightweight, it won’t be resource hog on your CPU.
Expect it to work with your digital audio workstation, and to find lots of patches and presets on the web for you to download and to use.
Demonstration
# 6 – MiniMogueVA by Voltkitchen
If you’re looking for a free alternative to Arturia’s Minimoog, or G-Media Minimonsta, then this MiniMogueVA is your choice!
The MiniMogueVA has so many good reviews that it had be on the list. As the name suggests, it’s modeled to match the original Minimoog synthesizers designed by the legendary Bob Moog. Expect the sounds it produces to be particularly rich and juicy, great for funk style music, electronic bass music, and the sub bass in dubstep wobbles.
It features 3 oscillators, one with tuning control, the other two with fine-tuning sliders, and the ability to turn the third oscillator into LFO with dedicated modulation knobs.
Though the original Minimoog had no noise generators, this one actually comes with a the ability to create pink and white noises from the third oscillator.
As to be expected, you get chorus, and delay effects among others, as well as the ability to use MIDI learn to control your software device.
Many people overwhelmingly consider this the absolute best free VST synth on the freeware market. The Minimoog sounds featured in Omnisphere are great, so it’d be awesome to give this a whirl.
Demonstration
# 7 – Proteus VX by E-MU Systems
E-MU systems is the maker of pro audio gear, from hardware synthesizers, audio interfaces, wireless audio transmitters, and digital-analog converters, software instruments, and even audio cables. They’re well known for their quality products, but they also have hidden gem in the “freeware” market: Proteus VX, a free VST synth.
Actually, it is rompler, meaning that it also utilizes samples as well synthesized sounds (like Omnisphere, hence, a worthy free alternative). It was base on the Proteus 2500, a vintage hardware synthesizer. It has the same sounds and factory bank as the original version, plus the ability to control it via 16 MIDI CC controls.
It features “High Voice Polyphony,” which is dependent upon the power of your system, and 54 different filter types, including multi-pole resonant filters, phasers, flangers, vocal filters and multi-parameter morphing filters.
Another cool thing about it is that it offer 24-bit 192kHz high quality audio playback. So you can expect an actual pro level audio quality from a synth that’s actually for free!
Being drag-and-drop based, you have select your presets easily, plus it can be used VSTi within your DAW, or as a stand-alone application.
Only downside… it isn’t supported anymore. Meaning that there aren’t anymore updates. But you can grab it and see it works on your system.
Demonstration
# 8 – Superwave P8 by Superwave
The Superwave P8 is a virtual analog subtractive synthesizer that’s considered the go-to emulator of the vintage synth Roland JP8000. This one perhaps one of the few if not only best free VST synth on this list that is more suitable for an advanced user than someone who is just starting out. It features many controls and parameters that can be overwhelming to a beginner, but satisfying to a pro.
Now, about its sound, which should be the primary reason to using a synthesizer. Considering that it’s loosely modeled off the Roland JP8000, its users have considered it one of the best sounding free VST synths on the freeware market. Expect it to have a fairly unique sound suitable for trance, new age, electronic music, house, or even pop. The pads are what many users consider its most attractive asset, because of the richness and thickness of the sounds that the P8 produces.
It features 2 oscillates that will producer sine, sawtooth, ramp, triangle, pulse waveforms, as well as white noise and pink noise. You can control the oscillators with using fine-tuning, detuning, and synchronized modulation. Its filters consist of 2 resonant filters, low pass, band pass, and high pass. It has 2 controlled amplifiers by level, pan, and on/off switch. The effects I see is simply a pair of mono delays, which can be controlled. You get up to 8 notes of polyphonic operation, portamento controls, and 64 high quality presents, all which can be controlled using MIDI CC control with “learn” capability.
If you aren’t familiar with it, and you already know your way around synthesizers, give it a try yourself. Chances are, from other reviews I’ve read, it is worth looking into.
Demonstration
# 9 – OB-Xd by discoDSP (prev. Datsounds)
There is a challenge with curating this list of best free VST synths, because, so far, many of the VST synths we have named can really be considered the “best” free synthesizers you can download. And discoDSP’s OB-Xd is constantly referred to as the “best” as well. And listening to its sounds, utilizing it’s interface, and working with its features, it’s hard to not see why this synth isn’t actually THE best. But, so are many of the others on the list…
So, what makes this one unique?
For starters, it was modeled on the Oberheim OB-X, OB-Xa and OB-8 synthesizers. These classic vintage hardware synths were famous back in the day, and contributed to many hit records. Right now, they continue to enjoy their legacy in this freeware plugin.
The developers claim that they are not “copying” the originals, but rather take the same features and improve upon them. Whatever that means, it just sounds good to me.
Expect all the features you should find in a standard synthesizers, as well as some cool sounding features like the “continuous blendable multimode filter,” which is a filter allowing you to blending different filter types (such as high-pass, band-pass) in different dB modes. Also, it works on 32 bit or 64 bit versions of Windows OS, as well as Mac.
If you want the classic sounding vintage synth Oberheim for practically nothing, or at least to get yourself familiar with it, give it a trying and download it.
Demonstration
# 10 – 44 S by GTG
Finally we have a synthesizer crafted by someone who creates synths strictly for personal use. Yes, the 44 S by GTG is synthesizer created by a musician and synthesist, and offered to the public for free.
Actually, there are many synthesizers by this creator for free, so you can take a look at his entire collection, starting with this GTG 4 S.
This particular synth was design to give a flat sound that you can sculpt. You can use the filters for creating interesting and pleasing distortions in the resonance. It also feature filter modulation, pulse-width modulation, and the ability to track the LFO with the keyboard.
This definitely another synthesizer to consider to try using. It is free, and has a good sound. Check it out.
Demonstration
Final Thoughts
As you can see, there are several options for downloading and using free synthesizers. Compiling this list was not as not a simple task, as there are several options that are actually very good. But you can know that this list covers practically all the 10 best free synth plugins that you can download.
We hope you enjoyed this post, and enjoyed discovering some possibly new free toys for your plugin collection.
If you have any thoughts, suggestion, or even question, please comment below in the comment box. We’ll be happy to know if you’ve ever tried one of these, or what you think is the best free synth plugin on the internet today.
No matter what level you’re currently at with recording, it’s important to have a variety of Virtual Studio Technology (VST) to utilize. In this article, we’re looking at some of the Best VST Free and Paid Instrument Plugins.
This will help you determine which of these programs are best for you since there’s a ton of options to choose from.
Hopefully, it’ll relieve you of the overwhelming feeling of trying to determine which of these programs is best for you.
Best VST Free Instrument Plugins
As noted, down below are ten of our favorite free VST (or audio plug-in) on synthesizers and samplers.
If you’re a beginner or want to learn how to use these products, then you should definitely consider some of these free variations.
2getheraudio Cheeze Machine
First on our list of free variations of VST for synthesizers and samplers, we have a product from 2getheraudio (together audio get it?).
Their completely free VST is deemed as the “Cheeze Machine”. The name represents exactly what the system does. It’s fun, and something everyone will love.
Overall, this is something that is surprisingly versatile. Besides the synth variations, the actual product itself includes an expanded oscillator section, convolution reverb, a vintage ensemble chorus, and 64-bit compatibility for VST, AU, AAX and other applications.
Also included, it has a bonus preview presets for Cheeze Machine Pro. Cheeze Machine Pro is an upcoming release with additional filters, pitch envelopes, and performance controls. Sweet!
All in all, this is a great product. Especially since it’s free! Consider downloading it and see how you like it for yourself.
Ample Sound Guitar M LITE II
Next up, we have a fantastic product from Ample Sound. This is a very simple and easy to use plug-in.The synthesizer itself works as an emulator for a Martin D-41 acoustic guitar. Other than that, it doesn’t do much of anything else.
However, since it’s completely free, it doesn’t hurt to download it and check it out. The reality is, having a synthesizer that emulates an acoustic guitar will be more useful to you than you might realize.
It works great and does everything you might expect it to do. Other than that, there isn’t much else to say.
Give it a download and check it out for yourself.
DSK The Grand
Next up, we have a fantastic system from DSK music. Just like the other systems in this section of the article, it’s an easy and free download.The system itself is a Grand Piano VST instrument. Very simple and easy to understand. There isn’t much beyond that.
It features 4 velocity layers, 4-6 samples/notes, has ADSR envelope control, has a reverb fx included.
Just like all of the products on this list, it’s available for Windows and Mac OS (32 and 64 bits).
If you want a simple, but fun piano VST, check it out! The free download won’t take long and you’ll be on your way to using it.
Full Bucket ModulAir
Next up, we have a fantastic product from Full Bucket Music. Deemed as the “ModulAir”, it’s a surprisingly versatile and great unit for being completely free.It’s a modular polyphonic software synthesizer for Microsoft Windows (VST) and Apple macOS (VST/AU). It’s meant as a way for high performance and low computer consumption.
Some of the features include up to 18 modules per patch, 51 module types available, polyphonic voicing, up to 64 voices polyphony, and much more.
For something completely free, you get a ton of stuff with it.
Give it a download and try it out yourself. I assure you that it’ll be totally worth the simple download.
HY-Plugins HY-Mono
Next up, we have a great product hy-plugins. Hy-plugins is a solely dedicated website for different plugins for DAWs.Making it a great source for instrument or effect plug-ins. They have easy to understand instructions for all of their plug-ins and a few different options for free versions.
As for their instrument plug-ins, this one specifically is great and free. For being completely free, it provides a decent amount of versatility.
Besides the overall functionality, it’s an easy download and you should check it out. The few seconds or minutes it takes to download are definitely worth it.
While you’re at it, check out some of their other downloads and see if anything else might interest you.
Matt Tytel Helm
Next up, we have a product from Matt Tytel deemed as “Helm”. Helm is an open-source VST synth. That means you’re free to install it anywhere on anything and edit the code to your liking.Meaning that if you’re experienced enough, you can manipulate the code to the point of creating something to exactly what you want.
This has a ton of advantages behind it. The ability to create, edit, and execute is almost endless. That is the advantage of something being open source.
As for the actual functionality, it works great if you’re not afraid to have a bunch of trial and error. Not everything will work how you want it right away, but it will if you can persevere.
All in all, give it a download. It’s definitely worth it and you might be surprised at what you might find.
ML PG8X
Next up, we have a product from KVR Audio. KVR Audio is a website dedicated to all things DAW oriented. Meaning it’s a great source to explore different options for recording.As for this specific product, it’s great. Just like everything else on this list, it’s a VST instrument plug-in. It was inspired by the JX-8P. The GUI is modeled after the pg-800, which is the external editor for the JX-8P.It has a ton of different features, such as 6 to 12 voice polyphony, an HP filter, stereo chorus, and much more.
Just like a lot of these free variations, you’ll be shocked at how much this can do. Definitely give it a download and see for yourself.
Ohm Force SymptOhm PE
Next up, we have a product from Ohmforce. Deemed as the “symptom PE”, this is a performer edition version of one of their other products.In simple terms, if you need a synth that isn’t overly complicated, then this is the product for you.The free performer edition gives you access to all of its for purchase version’s presets and a few other customizing options.
Sounds pretty cool right? For beginners, this is a great product for you to download and learn. It’s simple, easy to use, and allows you to fully understand this subject in the recording world.
Go ahead and give it a download. You won’t be disappointed!
Seaweed Audio Fathom Mono
Next up on our list, we have a product from Seaweed Audio. Deemed as the “Fathom Synth”, this is exactly what you expect it to be.A synth that is easy to use, free, and surprisingly versatile. If you want more, they have an option that provides more for a price.The Fathom is a modular VST synth that is great for crafting original waveforms with advanced modulation. Sounds great right?
However, the mono version of Fathom is what is completely free. Don’t be discouraged by this, you can accomplish a lot with the mono version.
Other than that, there isn’t much else to say. It’s great, free, and easy to use. What more could you want? Try it.
u-he Zebralette
Last our list, we have a product from Zebralette. Zebralett’s “Mini Zebra”, this is a smaller and free version of Zebra2.As noted, it’s a free synthesizer and is a basic introduction to Zebra2.
This is free for the main purpose of persuading you to try Zebra2 and upgrade.Citing that if one oscillator is as powerful as it is, imagine how much better the top-tier version is. Not to mention all the other features provided with it.
Definitely download it for yourself, and check it out! You won’t be disappointed.
Best VST Paid Instrument Plugins
For those of you who don’t know, a VST is an audio plug-in software interface that combines a software synthesizer and effects in a digital audio workstation (DAW).
In simple terms, they use a digital signal to emulate a real instrument in a digital workplace. Pretty cool right?
Down below, we’ve listed ten of our favorite for purchase VSTs and ten of our favorite free VSTs.
Spitfire Audio BBC Symphony Orchestra
First up on our list is a product from Spitfire Audio. Upon your first analysis, you may be scared away from the price of it all. However, trust me when I say that the price is worth it.
You have 55 instruments to choose from alone. This in and of itself should make the entire package worth it.
In simple terms, this is a top tier VST. The versatility of it all is staggering and will leave you with countless options to choose from. You simply can’t go wrong with this system. I don’t really know what else to say.
Definitely check it out, especially if you’re a professional recording engineer or have the ambition of becoming a professional.
Xfer Records Serum
Next up on our list, we have a product from Xfer Records.
Without going too in-depth, this system works beautifully. This wavetable synthesizer deemed as “Serum” allows for the controller to work at a rate of comfortability.
Something that is important in this work form. Factors such as high-quality sound and workflow with a sense of creativity and ease.
All in all, you can’t go wrong with this product. It works great, looks flawless, and does everything you want it to do and more.
If you can’t afford the entire price right at once, there is a very affordable monthly option that is available.
Definitely check it out, you won’t be disappointed. Mixcraft vst free.
Spectrasonics Keyscape
Next up on our list, we have a product from Spectrasonics. Spectrasonics has a huge list of VSTs to choose from; especially in the synthesizer world.
Make sure you look through each model to determine which one is best for you, or buy one of the box set options to get a bunch of them. It’s completely up to you, but all of them work great.
With ten years in the making, Spectrasonics crafted something special. The product features one of the largest selections of collector keyboards and it doesn’t disappoint.
All in all, you can’t go wrong with Spectrasonics. You won’t be disappointed and it’s certainly something that pro-level recording engineers need. Try it.
Kilohearts Phase Plant
Next up on our list, we have a product from Kilohearts. They refer to their VST as “Phase Plant” and they insist that it’s a versatile system for beginners or professionals.
Meaning that it operates at a rate that is comfortable, yet sophisticated enough for a professional to use. Something that is essential for this type of work.
As for the price, it’s extremely reasonable. Compared to other VSTs of a similar caliber, this certainly delivers similar results.
All in all, you can’t go wrong with this system. It does everything you need it to do and more.
I highly recommend it, and be sure to check out some of Kilohearts other products they offer.
Spectrasonics Omnisphere 2.6
Next up on our list, we have another product from Spectrasonics. Similar to their other product on our list, this is a fantastic system.
Deemed as the “Omnisphere”, it operates at a rate of sufficiency and excellency.
The versatility behind Omnisphere is incredible. Especially since it’s one of the only software synths to feature a hardware synth integration.
Meaning it can transform over 65 well-known hardware synthesizers. Besides that, there are a ton of different sounds and options you can capture with the system.
Making it one of the best VSTs available to the public.
For the price, you certainly get what you pay for, so don’t be afraid of the price.
All in all, check it out! You definitely won’t be disappointed and you’ll be blown away by it.
Arturia Pigments 2
Next up on our list, we have a fantastic product from Arturia. Arturia doesn’t disappoint with “Pigments 2”. This system works beautifully and can do everything you want it to do and more.
Since we’re focusing on synthesizers and instruments, the actual synth mode works great. It adds another element to your overall sound.
It transforms the design of your sounds with the samples it provides. All at the simple touch of a button you can adjust the density, envelope, size, and the ability to randomize parameters.
Causing you to fully dive into the system first-hand. Leaving you with an abundance of happiness knowing what you can accomplish.
The price is very reasonable; especially with what it comes with besides the synth options.
Definitely check it out, you won’t be disappointed.
Native Instruments Reaktor 6
Next up, we have a fantastic product from Native Instruments. Deemed as “Reaktor 6”, this system delivers what you need and more.
As for the actual synth options, you can’t go wrong with this unit. You have the ability to build custom synths and designate them exactly how you want them.
Leaving you with countless options and abilities to accomplish everything you want and more.
Besides the synth options, you can discover over 70 different included instruments and thousands of different sounds in the user library.
What more could you want? It gives you everything you need and more.
As for the price, it’s very reasonable and you won’t be disappointed. Try it.
Native Instruments Massive X
Next up, we have another system from Native Instruments. Deemed as “Massive X”, this united delivers the ability to control and change sound in a way that might not seem possible.
The synth options are great. You have the ability to create incredible sounds and have complete freedom for your advance sound design.
The entire system is built for the future. Meaning that it’s built for modern-day and the future of technology in the music world.
Similar to their other products, it’s very reasonable. You don’t have to spend too much money on this system to feel accomplished.
Go ahead and check it out. I assure you that you’ll be more than satisfied with it.
Softube Modular
Next up, we have a fantastic unit from Softube. Softube created a VST called “Softube Modular” and it certainly delivers.
Creating a product with the knowledge of modular synthesizers being a way of life in the music world. Noting the endless possibilities, and creation of unique and interesting sounds as the backbone of their products.
As for the actual features of the unit, it comes with seven essential modules and 50 stock modules that allow a certain utility and mixing ability of the product.
The price is fantastic. It’s extremely affordable and delivers more than what you might expect.
Go ahead and check this fantastic product out. You won’t be disappointed, especially because of how affordable it is.
iZotope Iris 2
Last, but not least on our for purchase VST list, we have a system from iZotope. Deemed as the “Iris 2”, this is exactly what you want from a VST.
It’s simple, easy to use, and just works. The company deems the product as being something very special.
They note it as an inspiring sample-based synthesizer. Meaning it has the power of a sampler and the flexibility of a traditional synth. Something that is common and works great for these types of VSTs.
All in all, you can’t wrong with something like this. You can either buy Iris 2 for a very reasonable price, or you can buy a package deal that comes with a variety of products they offer.
Check it out!
Conclusion
Thank you for taking the time to read this article. Hopefully, you were able to determine the best free and for purchase VST (or audio plug-in) on synthesizers and samplers.
Other than that, you should be able to have a general understanding of this subject in general and why they’re needed for a studio setting. With factors such as versatility and budget in mind.
For a quick recap, we went over ten of our favorite for purchase VSTs. We went over why we liked each product and some basic features of each one.
After that, we went over ten of our favorite free VSTs. We also went over why we liked each of these products and a few basic features of each one.
Saxophone Virtual
It’s important to determine what you want to accomplish with a system like this. If you’re looking to do a lot then you shouldn’t be scared to invest a decent amount of money into it.
Best Free Saxophone Vst
If you’re a beginner or just want to learn, then you should start out with one of the free products. The free versions of these systems will allow you to understand how they work and why they’re important.
Iowa Alto Sax
In conclusion, you should be more comfortable with deciding what free or for purchase VST (or audio plug-in) on synthesizers and samplers is for you.