# Roxsyn Guitar Synthesizer — Metamorphic Synth for Guitar

> Metamorphic guitar synthesizer app that directly synthesizes guitar input. (iPhone/iPad app by Yonac Inc..)

- Source: https://appshunter.io/ios/app/roxsyn-guitar-synthesizer/id1472450599 (this page in markdown: same URL + `.md`)
- Developer: [Yonac Inc.](https://appshunter.io/developer/288670023)
- Category: Music
- Price: $19.99
- Rating: 4.70/5 from 90 App Store ratings · 52 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 32 MB
- Languages: American English
- Released: 2019-08-05
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/roxsyn-guitar-synthesizer/id1472450599/reviews.md

## What is Roxsyn Guitar Synthesizer?

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.

::Arpeggiator::

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, Ableton Link. Native 64-bit processing at up to 96kHz. 160+ MIDI controllable parameters; MIDI learn & map save/share; tapedeck (in the standalone app), so you can record, loop & share your ideas on the go, and many more handy features.

## Key features

- Direct guitar synthesis (no MIDI)
- Metamorphic signal generators (oscillators)
- Dual filter banks with custom virtual-analog filters
- Guitar-optimized envelopes with adjustable triggers
- Powerful arpeggiator with multiple algorithms
- Modulation matrix for parameter control

## Recent user reviews (10 of 52)

All indexed reviews: https://appshunter.io/ios/app/roxsyn-guitar-synthesizer/id1472450599/reviews.md

### 5/5 — Great app!

*2025-12-02*

I love throwing this in my chain as a parallel part of the rig for a nice fusion lead tone.

### 5/5 — Dude!!!!!

*2025-01-11*

It’s so good , I don’t even want others to know about this app. I’m from a small Texas town and I’m not sure people are ready for me to blow their minds. This turned a bad day into a really great life. Genius developer.

### 3/5 — Bad

*2024-07-27*

App is not connecting as AUv3 plug-in with Loopy Pro and GarageBand. Wasted money.

**Developer response:** Hello! It does connect with those apps. Please contact us at info@yonac.com and we can help troubleshoot your issue. Thanks!

### 3/5 — Was expecting something useful

*2023-05-22*

Yonac makes some great apps. My favorites are the Steel Guitar Pro and the Galileo 2 in terms of usefulness and the way they fit with other apps and midi control effects in an app like AUM. I don’t have Magellan Synth 2 or the newest Trooper, which I would love to check out, but haven’t found the reason to spend $15 for each yet. 

There is a lack of consistent quality guitar interface synths with midi translation that maintain iOS updates. The decent ones seem to suddenly vanish - like midimorphosis.
That being said, that’s not what this app is. In fact there is no midi control function. It’s just a very thick and oozing filtering app that takes a guitar signal and destroys it with effect parameters commonly found on oscillation type synthesizers, with filtering, arping, and all of the other common audio effects, plus lots and lots of distortion. 
I have yet to find a use for it honestly, which is weird considering how many presets it has - presets that have very little range. Of you want to go from noisy lower pelagic oceanic deep distorted and modulated reverb to lush distorted low pass filtered arpeggiated offset delays that have no discernible pitch modulation, then there are millions of presets for everything in between those two. 
If there were better clean tones, o might be able to use this. 

A rare miss imo for Yonac, but you might find it vastly and useful.

### 1/5 — Zero tech-support if you have a problem

*2023-01-26*

It pains me to give this a negative review because the videos look so cool but after paying for it it has some problems and I am not able to successfully run it. I’ve reached out to tech-support through their website and emails multiple times over the past few weeks with zero response. I feel like my money has been stolen.

### 1/5 — 1-star for hobbling GarageBand on Apple Silicon, and not responding.

*2022-11-25*

Things do go wrong.  But this is two of this developer’s apps now, consistently cause GarageBand AUv3 issues, this is by far the worst for this (pls see below).  I gave it 3 stars for the hobbling of GarageBand, but now it’s one star because I think it’s being ignored.  I actually slightly object to being an unofficial test-pilot for the app-makers.  Being a test-pilot and the issue being ignored, for 3 apps (just got KASPAR and it’s got it’s own issues), is too much, sorry Yonac, please do fix it.  If it’s ongoing work, fine.  But that needs said, is all.

Love Yonac apps, have a lot of them, they are great. But, keeping up with Apple’s changes is stretching some developers it seems, and while some issues can be a quality issue, this literally stops the use of GarageBand, if it is placed an any FX list, for any instrument. Long story short, you are sent round and round, when you try to exit - but you can never exit and save. I have let Yonac support know. I won’t use an app if there is a fair chance it will lose me my work - and this is not a 50/50, it’s absolutely guaranteed, it does it ten out of ten times. Then I delete Roxsyn from the single track it’s on, and voila, all works as normal. Apple iPad Pro M1. 12.9” and iPadOS 15.7.1 so it could just be Apple Silicon affected? I don’t know. It’s above my IQ grade! Sorry Yonac, hope it can be fixed soon. I also have a similar issue with Yonac’s Galileo Organ 2, but I mentioned that to their support as well, it’s more like half the time, it fails to permit exit/save in GB.

**Developer response:** Hi! We use and test with Garage Band quite frequently. We haven't been able to replicate these issues, so hopefully they have been resolved. If not, please contact us. Thanks - The Yonac Team

### 1/5 — Uniquely unusable

*2022-10-01*

Noisy af, the patches all sound the same- none of them offering a sound that is usable in a musical setting. Better results can be easily obtained using a pitch shifter a delay and mod fx (all available for FREE). Great looking interface that doesn’t do much of anything useful.
I love the idea though- hope in the future this is updated with real oscillators and a sound palette worthy of the name “guitar synth”.

### 5/5 — Best damned app for iPad + guitar

*2022-08-03, version 1.0*

Bought this app for 0.99. I can’t stop playing with it on my iPads with the apogee jam interface!!!
So many sounds professional sounding arps & synths with pads and bass synths.
For me a jakoff guitar player, I love it because I don’t have to know music theory or guitar to play it because it does it all rhythm tempo plus you can get lost in designing your own sounds!
Great job Roxsyn keep up the good work!

### 1/5 — Doesn’t work

*2022-06-30*

I can’t get this to work in any shape or form. Can’t even get a single sound out of it. I have ToneStack pro and have zero issues with that so no idea why this doesn’t work. I’ve gone through every tips video, watched loads of other YouTube videos and still not found anything that makes this thing make any noise. I’ve tried reaching out to support for help but like other reviews I’ve had no response.

### 5/5 — 7 stars... I really mean it. 7 stars.

*2022-02-27*

The open ended capacity of this app is mind blowing. Started playing with it a month ago.
It's responsive, brilliant, wild.
The developer is a masterful cocreator for my music. 
It's a pleasure playing with you, brother…

## Frequently asked questions about Roxsyn Guitar Synthesizer

### What does the Roxsyn Guitar Synthesizer app do?

Roxsyn is a revolutionary app that transforms your guitar or bass into a fully featured polyphonic synthesizer. It synthesizes your instrument's sound directly, without relying on MIDI, capturing the nuances of your playing like vibrato, slides, and bends for a rich and expressive synth experience.

### What are the key features of Roxsyn?

Key features include its direct guitar synthesis technology, three metamorphic signal generators with unique waveforms, dual filter banks with custom virtual-analog filters, guitar-optimized envelopes driven by playing dynamics, and a powerful arpeggiator for creating complex patterns. It also offers a modulation matrix for extensive sound sculpting.

### How do I connect my guitar to Roxsyn?

You do not need special MIDI pickups or hardware. Simply plug your guitar into your favorite Lightning or USB audio interface, and then connect that interface to your device running the Roxsyn app. This allows for a direct connection to the synthesizer engine.

### What makes Roxsyn different from other guitar synths?

Unlike traditional guitar-to-MIDI synths that can be temperamental and lose human playing nuances, Roxsyn uses a completely new approach. Its metamorphic sound generation technology synthesizes your guitar directly, avoiding pitch tracking errors and preserving the full expressiveness of your playing.

### Is Roxsyn compatible with all guitars and basses?

The app is designed to work with both guitars and basses. As long as you can connect your instrument to a compatible Lightning or USB audio interface, you should be able to use Roxsyn to create synthesized sounds.

## Version history (last 4 releases)

### 1.3 — 2024-11-14

This is an important update that modernizes the MIDI functionality in the AUv3 context, and also ensures general robustness for the iOS 18. It provides additional optimizations to the AUv3 and standalone packages.

The AUv3 plugin dispenses with its “external” MIDI in port, which is deprecated. All MIDI connections to the Roxsyn AUv3 should be managed via the hosting application or DAW instead, which is now the correct convention. If your plugin hosts / DAWs don’t automatically route MIDI into FX plugins, please refer to their documentation to learn how to do so.

### 1.2 — 2024-02-07

• Increases robustness of the MIDI implementation
• Other improvements & fixes

### 1.1 — 2023-09-25

• Addresses an issue where AUv3 plugin could become unresponsive when added to a mono in / mono out DAW track
• Adds iOS Files app support
• Improvements to state management
• Improvements to the UI
• Updates to ensure compatibility with newer operating systems
• Other improvements & optimizations

### 1.0 — 2019-08-05

No release notes.

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## More apps by Yonac Inc.

- [Steel Guitar](https://appshunter.io/ios/app/steel-guitar/id323813692)
- [miniSynth 2](https://appshunter.io/ios/app/minisynth-2/id616496999)
- [ToneStack](https://appshunter.io/ios/app/tonestack/id870269510)
- [ToneStack GO](https://appshunter.io/ios/app/tonestack-go/id904057679)
- [KASPAR](https://appshunter.io/ios/app/kaspar/id1245045964)
- [Kauldron Synthesizer](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609)

All apps by Yonac Inc.: https://appshunter.io/developer/288670023

## Related topics

[synthesizer guitar](https://appshunter.io/ios/topics/synthesizer-guitar)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*