Rated as a Killer App by Apps4iDevices!

The Sonuus G2M - Universal Guitar-to-MIDI Converter app delivers high-performance, low-latency, MIDI conversion for guitar (and other musical instruments). Featuring the same pitch-to-MIDI technology used in Sonuus' acclaimed hardware products, the G2M app gives you an easy, low-cost way to enter the world of MIDI guitar.

In 2009, Sonuus rocked the music world with the launch of the G2M: a low-cost hardware MIDI converter that redefined how guitarists access MIDI instruments. Previously, the only solution was to add special pickups to your guitar, or use a specially-built guitar for MIDI. The G2M made it possible, for the first time, to use any guitar with MIDI, hence it's: "universal".

This G2M app gives you access to the same technology of the Sonuus hardware G2M:

() Any electric guitar can be used as a solo MIDI guitar: i.e., it's universal.
() No guitar modifications or special pickups required.
() Robust note detection — minimises wrong notes.
() Velocity detection of notes, so your playing dynamics are translated into MIDI messages.
() Fast, accurate pitch-bend determination, or alternative chromatic mode.
() Very low latency & very fast tracking.
() Built-in, precise tuner.

These features combine to do something that no other MIDI converters can do: accurately capture the musicality and phrasing of what you are playing. Whether you want to lay down a MIDI bass line, or a saxophone solo, the G2M ensures the musical nuances of what you play are retained.

In addition, the G2M app:

() Has very low CPU usage, so it can run in the background without affecting other music apps.
() Can send MIDI to other apps (synths), over Wi-Fi, or to MIDI interfaces connected to the dock connector.
() Displays a glorious user-interface showing you the real-time MIDI messages as they are sent.
() Supports bass and guitar with a note detection range spanning from E1 (low E on a 4-string bass) to Bb6 (higher than a 24 fret guitar can play).

To use the G2M, you can use the built-in microphone but you get much better results by using an adapter that lets you connect your guitar directly to your iPhone, iPod or iPod Touch. For example, the i-ROCK adapter lets you connect your guitar to the mic/headset input.

The G2M works with all iOS devices with OS4.2 and above: from the iPod Touch 2nd Gen to the latest iPhone.


Note1: the G2M is monophonic, meaning it will only process single notes, not chords.

Note2: when a guitar is connected to the microphone input, the lowest guitar notes (below A2) may not be processed correctly because most devices have a high-pass filter on this input which rejects the low notes. To avoid this and access the full range of playable notes, you can use an audio input device that connects to the dock connector instead.

What's New

Version 1.1.0

Fixed bug where PANIC and TEST MIDI buttons did not function.

Added new improved FLAME tuner display.

Ratings and Reviews

Good at tracking monophonic notes


I've had a blast with this app. It can't track more than one note at once, so don't expect to be able to play chords or even octaves with it. It has trouble tracking low notes too, but that is expected with any pitch detection algorithm. Definitely use an AD interface like the apogee jam. Anything that is analog will cause extra latency.

Fast and pitch bend!


Several of the other audio to midi converters do well too, but all others are missing pitchbend except for this one and thumbjam. I recommend this for bass synths especially.

A huge fail


I suggest midi guitar or midimorphosis both nice and both far better. I use both for different things. Either one above would be far better, I my opinion. This one has been deleted from my ipad. I have tried to like this but it has failed every time to produce any worthy comment.

If for some reason you get this and are discouraged from ipad midi guitar interfacing get the others I listed.


Sonuus Limited
3.3 MB
Requires iOS 4.2 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2013 Sonuus Limited


  • Family Sharing

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

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