Boutique VST Plug-ins


Long overdue update:

Hello everyone! RAS is still working hard to bring you new and innovative products and improve upon our existing lineup.

Work is still progressing on I.C.E. Drive, where progress is still being made to improve CPU usage for real-time use. Some alterations have been implemented to improve the tool’s functionality for soundbyte farming, including increasing the step resolution for fixed RPM from 2K increments to 500 RPM increments. A granular sweep will also be implemented soon. Focus is being put on the turbocharger element to improve its realism and response.

The as-of-yet-unnamed 80′s polysynth project has been split into two entities, but will remained intertwined in a unique way. More on that as the products come closer to completion. Both units are coming together to sound phenomenal, close to the spirit of 80′s synth design, and efficient enough to run live at 96KHz without dominating available CPU headroom.

The FM Array synth project is in a state of flux, where the outcome will probably be scrapping the project as a unit but carrying over certain design ideas to build anew in a more efficient and intuitive manner.

I’ve been doing preliminary research into bringing my synths from the realm of software-only into a tangible keyboard (or at least desktop module) unit. This plan is only in its infancy, however, so it may be a while before this comes to fruition.

We’re gaining momentum again here, and I want as many people to share in this as possible at the ground floor. Keep an eye on our RAS Facebook page and be sure to share, link, and like us with all of your friends, musically-inclined and otherwise.

Small Update…

Hello everyone,

After an extensive time sans-updates, I felt I should add a few things to the main site here.

Firstly, Roberson Audio Synthesizers IS still going strong. I am maintaining a presence on Facebook at , so if you haven’t already, please follow the link and “like” the RAS page.

Secondly, as you may have noticed, the RAS web page has been up and down quite a bit as of late. I am considering a different hosting service, so that I may provide a more reliable outlet for purchases. Rest assured, however, that any questions and support will be answered and provided at as quickly as possible.

Development continues for the next update of I.C.E. Drive. Improvements to the sound core have dropped maximum CPU usage to less than half of what version 1.0 takes, and added features intended to improve and simplify sample harvesting. Updates on progress will be posted as they arise.

Lastly, because I have linked them to the Facebook page and not here, I’m posting some playlists containing samples of the two main musical synthesizers in the works. These samples are slightly dated, so the sound quality and versatility has improved greatly since they were recorded.

Take care folks and thank you for supporting RAS.

Samples for 80′s Style Poly Synth:

Samples for FM Array Synth:

Introducing: I.C.E. Drive!

Alright folks, the long-anticipated release of the engine sound synthesizer has finally arrived:

I.C.E. Drive

Finally, a solution for those that need engine sfx without having to track down and record an original source.

From I.C.E. Drive’s Page:

I.C.E. Drive specializes in replicating the sounds of internal combustion engines through limited physical modelling. It can simulate engines of cylinder counts between 2 and 12, and with tweaking can simulate rotary and 2-stroke engine sounds. With simulated forced-induction as well as a virtual transmission that allows the simulation of “driving” the synth much like a real car in a straight line, as well as support for the wireless XBOX 360 Controller for operation, there is no better option on the market.

Special System Reqs:

It should be noted that I.C.E. Drive is a fairly cpu-heavy tool; on my build and test machine running an AMD Phenom II 965BE at 3.8GHz per core, the tool uses roughly between 35-50% of processor time.


The I.C.E. Drive plugin is available at a price of $150 USD, plus an additional 8.25% sales tax to Texas buyers, and comes serialized to the buyer.

Currently, Roberson Audio Synthesizers is only accepting payment through PayPal.

Given the fact that all transactions are processed individually rather than purely by computer, please allow one to two days maximum to receive the plugin through email.

*Click Here for I.C.E. Drive!*

I.C.E. Drive PE

Enjoy the sounds at a fraction of the cost:

I.C.E. Drive was first and foremost designed as a production tool, to assist in creating engine sound effects for movies, TV shows, games, etc. RAS recognizes, however, that not everyone that would like to enjoy this product is a producer or sound engineer. For that reason, I’ve created a special feature-limited edition that contains all 32 of the original presets and can be controlled the same way as the fully-featured version, but cannot be tweaked or automated beyond what is seen on the screen.

This tool is ideal for car enthusiasts and casual users alike, those that would wish to hear their favorite engine sounds even though they may not own a vehicle with such an engine, or if they do own such an engine and simply want to enjoy the sound while away from the vehicle.

Special System Reqs:

It should be noted that I.C.E. Drive is a fairly cpu-heavy tool; on my build and test machine running an AMD Phenom II 965BE at 3.8GHz per core, the tool uses roughly between 35-50% of processor time.


Pricing of the Player Edition is 1/10th the cost of the fully-featured edition, or to be specific, $15 USD (+8.25% sales tax for Texas buyers), and comes serialized to the buyer.

Currently, Roberson Audio Synthesizers is only accepting payment through PayPal.

Given the fact that all transactions are processed individually rather than purely by computer, please allow one to two days maximum to receive the plugin through email.

Enjoy a little slice of automotive heaven right from your desktop! Order today!

*Click Here for I.C.E. Drive PE!*

Tomorrow is the day!

Just a reminder everyone:

Tomorrow, April 27, the engine synth goes on sale to the public!

Pricing has been decided at:

$150 USD for the fully-featured production version

$15 USD for the feature-limited, non-production “Preset Edition” version

For those that haven’t been following on the RAS Facebook Page (hint: go there and follow RAS now!), here is a small collection of samples of the instrument so far:

In the meantime, I’ve created a small plugin that allows you to test compatibility of the wireless XBOX 360 controller on your system. In the event that not being able to use the controller with the engine synth would be a deal-breaker, this app will allow you to double-check before you purchase, just to be sure. It can be downloaded here.



New Prophanity upload: Prophanity FE

Another update to Prophanity has just been uploaded: Prophanity version 1.5 Factory Edition.

Only a few small changes have been made to the actual sound core, but this particular instance has been programmed with 32 of the 40 factory presets of the original Prophet 5. The only drawback is that unison functionality has been broken; now instead of unison mode triggering all voices at once, it enables per-voice detuning but only triggers one voice at a time. This can be used, however, to simulate in a limited fashion the potential for per-voice drift in older analog poly synths.

You can download this new version, as well as the older version 1.4, on the Prophanity page.

I hope everyone enjoys!


We’re back!

After a couple of weeks of server downtime, Roberson Audio Synthesizers is finally back online.

Plans for the engine synthesizer to be available for purchase have been moved back to April 27th, next Saturday.

For the slim chance that there is another service outage for the site, please follow Roberson Audio Synthesizers on the business Facebook Page !

Sound demos of the engine synth are still soon to be posted pending some coding issues to work out with the site. Pricing will be announced as well.

More updates to come as RAS continues preparation for sales!

It’s now official…

Roberson Audio Synthesizers has some exciting news:

As of April 15th, I will be officially open for business!

That’s right, I’m branching out from doing freeware replica software to providing completely original intellectual properties, first of which being the much-talked-about engine sound synthesizer.

Pricing has yet to be decided, but currently plans are to offer a fully-tweakable version for those that want to customize and create sounds from scratch, and a trimmed-down “player” version that allows no tweakability but still fully behaves as the full version in terms of virtual engine operation and includes the same factory presets, essentially a little something for those that simply want the feeling of revving a hot rod V8 or supercar V12 straight from their desktop. ;)

Another major product in the Roberson Audio Synthesizers pipeline is a new take on FM synthesis, offering the broad sonic palette inherent to FM synthesis with the ease of access of wavetable synthesis. The name has yet to be decided, but the majority of the sound path has been constructed and so far results are very promising!

Sound bytes to come soon for both instruments.

With all of this said, however, Roberson Audio Synthesizers has not completely abandoned freeware from its efforts: to commemorate RAS being officially established as a business (and not just a hobby), I will be uploading an updated version of Prophanity! This new upload will include 32 of the factory presets from the original Prophet 5 and will also include some minor changes to the sound circuit for just that touch more of the idealized analog sound. An update will be posted when this new version of the synth becomes available.

And on the note of updates, Roberson Audio Synthesizers now has a Facebook business page!

If you are a Facebook user and want a easier way to find out news about RAS or contact me for questions or comments on existing or upcoming products, follow the link and “like” the business Facebook page!

Furthermore, I will no longer be fielding questions or comments at the address; if you want to use email to contact me, you must write to . Any further inquiry emails to will be ignored. I’m sorry to have to tow such a hard line, but it is imperative that my communication traffic be shifted away from lycos and to a dedicated business email. Thanks for your cooperation. :)

I think that that about covers all the news for RAS for now.

To sum it up:

Be sure to “like” the Facebook page for quicker access to news and the ability to contact me!

New sound demos coming soon!

New Prophanity version coming soon!

Cheers to all, I hope my products have given you much pleasure in use so far and I hope my new ones will be able to continue to do so.


Onward and Upward…

Hello folks!

Well, good news, I’ve finally finished my Bachelor of Arts degree!

With that done, I now have more time to devote to the site and my instruments, at least until I find a more permanent career.

Now, onto business:

I’ve created pages for and provided download links to a couple of my old instruments, Mini-Vyn and TerVoxSyn. Of all my older creations that didn’t have pages here already, those two were the ones that I received the most mail about, asking where they could be downloaded and if they were still available.

As a refresher (or for those that have never seen them), Mini-Vyn was my first big virtual analog synth, and TerVoxSyn was my Theremin emulation. Both of them are excellent pieces, in my opinion. Let me know if there is any trouble downloading them.

I’ve also updated all of my info at . If you are here after having visited there, welcome. :)  I hope to use that site as another avenue for promotion and troubleshooting if necessary.

Other projects:

-I’ve made some progress with my engine synth. At this point it really is a game of tidying things up, so making sure that the minutia is in order is taking quite a while.

-My hybrid analog/PCM pad synth is coming along nicely. Within that project, I am playing with some interesting ideas involving Soundfonts and real wavetable scanning.

That should just about do it for now. As I mentioned, I plan on devoting more time to my instrument work since I don’t have studies that need devotion any longer.

Enjoy the new (old) synths. :)


House Cleaning…

Hello folks!

As you’ve no doubt noticed, I haven’t been able to post for quite a while. Something about finishing one’s education and trying to do a thesis eats a lot of time. :D

Anyways, I felt it was about time to post up a brief update:

–Currently, I’ve made continued progress on the engine synth:
1. I was able to isolate and remove most of a sort of “zipper” effect that came from ramping cylinder detonation pitch while changing global RPM.

2. I built a working manu-matic shifter setup.

3. ESPECIALLY FOR GAME DEVS: I’ve included a component that allows for static RPM and throttle/load settings at 2K, 4K, 6K, and 8K RPM, in an effort to streamline the recording of samples for sample maps in game usage. I’m considering writing a MIDI file to be included with the instrument as well that essentially allows one to hit record and press play and generate a sound clip that can be chopped and trimmed to fit each RPM band sample

All that I feel I have left to build is to integrate a braking system, reintegrate a turbo and supercharger, and design a UI and maybe aside from a few small tidying up tasks it will be commercially ready to go.

–I’ve completed to about 60-70% a synth that is a hybrid virtual analog and PCM playback engine, designed specifically for long, evolving, esoteric sounds. To be quite honest, I was inspired by the concepts of the FIZMO and by the works of youtube user BetterOffTed; if you happen to see this Ted, props to you, I could listen to some of those vid clips all day.

–On a related note, I’m currently in the market for a FIZMO. If you have one and are looking to sell or know someone that is, by all means, pass the info on. :D

–I have not really made any progress at all with my previously mentioned DX7 and CS-80 synths. Currently, I’ve fully-built the framework of a DX7, but it seems to be lacking some finer details that made that synth what it was, and I’m not sure if I’ll pick up that project any time soon. As for the CS-80, I began framing the instrument virtually, got about half-way through the first voice path, and was forced to drop it for other more pressing matters. Like the DX7, I’m not sure when or even if I’ll pick it up again. Sorry gang. :(

–Soon I hope to re-host my KVR competition entry from a few years back, the Mini-Vyn, on this site. I had a chance to sit and play around with about a month ago and I had forgotten just how absolutely wicked the filter in that thing can sound. As soon as I can set aside time and get it sorted, I’ll try to post it up. :)

Well folks, I think that about does it for now. I’ll try to be more regular with status updates in the future, but as I said, working on a thesis kinda absorbs a lot of your time.


New Blog Up!

Hello folks!

Just posting to make you all aware of a new blog I’ve created, the Roberson Audio Synth Review!

This blog will be my dedicated venue to talk about new synth technology and new music creation technology that comes out without cluttering the news feed here at the Roberson Audio Synthesizers home page. This way, you can get a purely Roberson Audio-based feed for all your news about our instruments!

I hope to see you guys over there. :)

In a similar bit of news, I’ve finished the semester finally and am on to summer break, so I will be operating Roberson Audio on a much more full-on basis for at least the remainder of the summer. I unfortunately don’t have more news on instruments from Roberson Audio at the moment, but I have many plans that I want to have accomplished before the summer is over, so stay tuned and get in touch if there is anything RAS can do for you. :)

Chris Roberson