Introducing a revolutionary new way to turn your guitar or bass into a fully featured polyphonic synth: Roxsyn, the world’s first metamorphic guitar synthesizer. Expressive, fast and responsive to every nuance, it is a league apart from all other guitar synths to date.

Unhappy with cold and temperamental guitar-to-MIDI synths that dominate the market, we developed a completely new approach to guitar synthesis. Our all-original technology synthesizes your guitar directly, without the use of MIDI notes. Rescued from being a poor keyboard substitute, your guitar suddenly becomes an integral part of the synth. It's alive!

There is no pitch tracking involved. There are no pitch estimation errors, octave glitches, or garbled chords. There is no over-complicated G2M between your guitar and synth to destroy everything human about your playing. Instead, Roxsyn’s metamorphic sound generation technology retains all the personality of your sound: vibrato, slides, bends, dynamics, even extended technique. The result is a polyphonic synthesizer that is as fast and accurate as it is richly expressive.

No need for special MIDI pickups or hardware, either: just plug into your favorite Lightning/USB audio interface, and start synthing!

::Powerful Synth Engine::

Roxsyn’s big synth heart is its three metamorphic signal generators (AKA oscillators). Each generator offers 5 unique waveforms, and has a 4+ octave range to cover a wide spectrum of frequencies. They also feature stereo panning, and can route into either of Roxsyn’s dual filter banks. You can even dial in your guitar directly into the synth engine for even bigger sounds.

::Dual Filter Banks::

Each containing four custom virtual-analog filter types and dedicated envelopes, the filter banks help sculpt the synth generators in countless new ways. The envelopes are specially designed for the guitar, and are driven by a fully adjustable automatic trigger generator controlled by your playing dynamics. Envelopes offer original features like finite-duration sustain stages, as well as the ability to receive or ignore trigger-off messages. They can also be triggered externally via MIDI controllers like an expression pedal.

An additonal envelope controls the amplitude of the signal, giving you even more options in creating synth sounds.


Instantly transform sustained guitar notes into fast (or slow), complex patterns with Roxsyn’s powerful yet easy to use arp. There are 8 stepping algorithms to choose from, as well as settable note value, swing, and note repeats. You can even route the arp to any combination of the 3 voice generators — enabling you to layer a non-arpeggiated sound with an arp pattern. What's more, the arp can send trigger signals into any of Roxsyn’s 4 envelopes, and even reset the LFOs. So it’s also a handy rhythmic / trance tool as well!

::Modulation & FX::

Roxsyn’s user friendly modulation matrix lets you manipulate parameters (pitch, amplitude, filters, etc) using its two LFOs and mod envelope. Add subtle vibrato, even glide simulation, or go full-on berserk. LFOs each have 9 waveforms, and feature beat syncing. Each matrix row can take LFOs or the mod envelope as a modulator or control, and can even use external control sources.

And if you like your synths on the spicy side, Roxsyn comes with top-notch stereo FX specially developed to evoke extra synthiness: Powerful algorithmic reverb with the sound of countless rooms, phasing, modulating, 2-channel delay, and graphic EQ.

::Pro Features::

500+ factory presets with bass, lead, pad, arp sounds & more. Easily create & share your own presets. Audio Unit v3, IAA, Audiobus, Ableton Link. 64-bit processing at up to 96kHz. 160+ MIDI controllable parameters; MIDI learn & map save/share. Tapedeck (in the app), so you can record, loop & share your ideas on the go. Just some of Roxsyn’s professional features that make life and music a little bit easier.

Ratings and Reviews

4.6 out of 5
53 Ratings

53 Ratings

sneJ ,

Better than a $200 pedal

This sounds better than Boss’s much-hyped new $200 synth pedal. The Boss demos/videos I’ve seen all have cheesy ‘80s synth sounds; if I wanted to play those, I’d just use a synth. The special sauce here is that Roxsyn produces more complex, interesting sounds (though it can still sound like Miami Vice if you want that.)
The tracking and polyphony are quite good. Not perfect, but once you tweak the tracking it’s quite easy to play. It does glitch sometimes, but I embrace that as part of the sound. (20 years from now that’ll be “retro” and everyone will be emulating tracking glitches...)

Fretless33 ,

Nearly perfect!

Seamless tracking, incredible patches to select from, easy to tweak...what more can I say! I play bass and this app has no key limit like other similar apps...every step further I take into this app is completely inspiring! However, in the stand alone version it chooses the left channel from my audio interface so my guitar mix only plays out of the left side and I can’t find a way to change the input channel, but in AUM I am able to select the proper channel from my interface which bypasses that issue. Keep up the great work Yonac! 🙌🏻🔥‼️💖

Shivascreams ,

The Shizzle!

OMG this thing is sssssoooooo awesome! It’s gonna put Roland out of business. I’ve been playing for over 40 years , spent at least $50,000 on equipment and this is best and funnest effect I’ve ever used. The best $10- I’ve ever spent in my life. I think people(Roland) get greedy and they don’t realize that the more affordable you keep things, the more money you’ll make in the long run if you have a good product. Success leaves clues. Would you rather sell a million hamburgers for $20- or be like Mc Donald’s and make billions... duhhhh


Yonac Inc.
34.8 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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