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Welcome to our Zone Series of Synthesizers! Our Zone Series instruments provide features that enable artists to explore a specific canvas of sounds with an analog flavor. When you know exactly what type of sound you are searching for, it is time to get into the Zone!

Coming Soon!

Freeware Zone Synthesizers!

Acid Zone VST B-Line 303- Version 3 is here!  Now available for download and it is Free!

New freeware monophonic dual oscillator bass line synthesizer, B-Line 303 (version 3.0), captures the vibe and sound of classic EDM and Acid techno music synthesizers from the 70’s and 80’s. B-Line 303 includes our new synth engine and gives producers new unique abilities to shape their sounds. 


New in Version 3 is the Pattern Control Filter (PCF) that adds iconic Acid style tweaks to the sound. The PCF allows any midi pattern to be manipulated into an almost infinite pallet of Acid goodness. B-Line 303 now has our own groove sequencer as an alternative method of old school sound generation along with standard midi. B-Line 303 now comes with 50 designer presets to get you started but has room for up to 200 presets. In order to create the entire Acid bass sound experience, B-Line 303 comes equipped with our improved Stereo Doppler Chorus effect and a Stereo Echo effect.


200 user presets, 50 custom presets

Midi automation

Pattern Control Filter

Groove Sequencer

Doppler Chorus, Stereo Echo effect

VST 2.4 effect!

Why is B-Line 303 Now Free?

It was approximately 15 years ago when SonicXTC was hired by Dave Smith (Dave Smith Instruments) to create sound content for Seer Systems Inc., and the company's software synthesizers Reality and SurReal. It was a great honor to be introduced to the software music manufacture industry by Dave Smith and fellow MIDI pioneer Stanley Jungleib!

B-Line 303 now includes our new synth engine that we are testing out. B-Line 303 is not a glorified Beta release. It is a fully functional program that we are offering free to the public to mark our 15 year anniversary hanging around an industry that we enjoy! We hope you enjoy B-Line 303 and please remain on the look out for new SonicXTC products! Any feedback on B-Line 303 can be sent to [email protected]!

  Some of B-Line 303's special features!

Chaos Under Control- One secret to obtaining classic Acid sound is the ability to tweak parameters in a rhythmic fashion in order to gain optimum expressiveness!  The included Pattern Control Filter (PCF) allows the user to create amazing unique patterns to control the different filters included in B-Line 303.

Imagine recording a simple midi bass line in your digital audio workstation (DAW) of choice. With the B-Line 303 internal  PCF unit, you can transform that single simple bass line into an almost endless number of new and unique Acid riffs by just drawing in your own PCF patterns! With midi automation, you can easily combine your PCF tweaks with all the other B-Line 303 sound sculpting tools to maximize your creativity. With the new Groove Sequencer included in version 3, B-Line 303 is a solid weapon for the creation of Acid and other classic EDM styles! 

Classic Analog Oscillator emulation-We burned the midnight oil to develop our own saw and square wave emulation. In the end we think we captured a lot of the true dynamic range a traditional analog signal would generate. While B-Line 303 does not sound exactly like the old classics (or new analog classics) it has a vibe all of its own that is fun and inspirational to play.

Waves to ride- B-Line 303 is a two oscillator synthesizer at its core. We have included over 40 plus wave shapes to help sculpt B-Line 303's sound! The advantage of having two oscillators is the fact that B-Line 303 now has a broader spectrum of sound creation possibilities under the hood. Unison and De-tune effects are now possible and B-Line 303 can generate some nasty growls and howls due to the built in Drive unit and self oscillating Filters! Truth be told, B-Line 303's filters kind of suck! But they are bad in a good way as they make B-Line 303 almost feel like a 30 year old synth relic that has been either neglected or slightly abused after too many band road trips and beer spills. In other words, B-Line 303 has some personality that begs to be tinkered with!

Classic Effects- B-Line 303 also contains our Stereo Doppler effect that is also available on freeware Deep Step-606 and freeware Deep Mono! Imagine standing on a street corner when an ambulance is approaching  with a siren sounding. As the ambulance approaches you will notice the pitch of the siren going up. After the ambulance passes by you will notice the siren sound drop in pitch. This is a simple example of the "Doppler" effect. Our Stereo Doppler effect is a resonant chorus combined with a subtle pitch shifter. At extreme levels the Stereo Doppler effect almost sounds like a unison or doubler effect adding additional movement and body to the sound. If you ever listen to old Acid tracks you might notice that the TB-303 tracks were often doubled to achieve more fullness of sound. Our Stereo Doppler effect is designed to simulate that "two tracks doubled but not quite in sync" sound of an old analog 24 track tape deck.
To complete that Acid techno experience, B-Line 303 also includes our Stereo Delay Module. We routed this delay module to make the sound bounce around in very interesting ways. Please understand that this delay is designed specifically for dance music as the delays are always in musical time (double time or in triplets). For simulations of asymmetric delays which are the type of delays that generally occur in nature, please check out our products Liquid Delay or Liquid Verb.

Full of NRG! New freeware 3 oscillator synthesizer, Hi-NRG Zone Retro LE, is the latest offering in our Zone series. It is designed to allow easy access to those old classic synthesizer sounds that defined the “Hi-NRG” vibe on the dance floor. Like Deep Mono, Deep Step-606, AZR-01, and TZR-01, HZR-01 is simple to program and has all the synth programming parameters on the front panel.  Tweak a knob and you immediately begin to sculpt the sound. It comes with 16 presets to get you started down the Hi-NRG path!

Just Like A DIY Synthesizer!  New monophonic single oscillator synthesizer, Acid Zone Retro, is a synth that harkens back to the DIY analog synths of the past. Similar to Deep Mono and Deep Step-606, AZR-01 is simple to program and has all the synth programming parameters available right on the front panel.  Tweak a knob and you immediately begin to sculpt the sound. It comes with 32 presets to get you started but can cover a lot of sonic ground. The sequencer included in AZR-01 was derived from reviewing the many sequencer schematics available on the Flowstone/Synthmaker community forum! We made our modifications but wish to thank all the forum developers for sharing their creative and groundbreaking work. This synthesizer is our tribute to the Flowstone developer community!

Why We Like It!

Music is about tinkering to come up with something new and different. AZR-01 is a blast to the past in a way that makes forging ahead into new sonic territory fun and creative.

Why We Think You Will Like It!

AZR-01 has a raw sound similar to an old DIY synthesizer that can really cut through in a mix. The old school delay and reverb unit allows for additional sonic manipulation.

New freeware 5 oscillator synthesizer, Trance Zone Retro LE, is a recreation of those old classic synthesizers that brought the “Super Saw” sound to the dance floor. Like Deep Mono, Deep Step-606, and AZR-01, TZR-01 is simple to program and has all the synth programming parameters on the front panel.  Tweak a knob and you immediately begin to sculpt the sound. It comes with 16 presets to get you started down the Super Saw path!

Why we like it!

There are a few really nice free and for sale Trance VST's on the market. So what is the problem? Simple, almost all of them provide canned "super saw" waveforms that you either like or do not. You can not alter them in any real way. TZR-01 allows you to mix 5 oscillators separately to create your own "super saw" sound. This is sound synthesis the old fashioned way!

Why we think you will like it!

With 5 oscillators to play with TZR-01 can sound really large. It is easy to program and the sounds you can create are almost always tweakable to be original and fresh.

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