GR-55 Editor

Create and organize patches on the go

GR-55 Synthesizer

Control your Roland GR-55 synthesizer directly from a phone or tablet

Available on Apple TestFlight

Get it on Google Play

Try the web version

App Screenshot

About GR-55 Editor

GR-55 Editor is an iOS/Android/web app for use with the Roland GR-55 Guitar Synthesizer. Switch patches on the fly, easily tweak parameters in the active patch, or even edit assigns—all from a convenient touchscreen interface.

System requirements

The app is compatible with the standard MIDI support available in recent versions of iOS and Android, as well as in Chrome on PC/Mac/Android (for the web version).

You can use a wired or wireless MIDI connection. For the most convenient experience, connect the GR-55 to a Bluetooth MIDI adapter such as the Yamaha MD-BT01 or CME WIDI Master.

Source code and acknowledgements

GR-55 Editor is an open source app. The source code is available on GitHub.

This project is indebted to the legendary GR-55Floorboard by Colin Wilcocks (@gumtown) and the VGuitarForums GR-55 community.

Quick Start Instructions

1. Connect your GR-55

Connect your GR-55 to your phone or tablet using a MIDI adapter.

In the app, go to the Setup tab and select your MIDI adapter as both the Input and Output port. You should see the GR-55 listed under "Connected Devices".

If using a Bluetooth MIDI adapter, tap the icon in the top right corner of the Setup tab to scan for and connect to your adapter. Note that Bluetooth scanning is not available in the web version.

2. Browse patches

Go to the Library tab to see a list of all patches currently stored in your GR-55. Tap any patch name to load it instantly.

You can also search for patches by name using the search bar at the top of the screen.

3. Edit and save patches

The Patch tab shows an overview of the current patch. You can quickly adjust the overall patch level and select which tones and effects should be active. Tap any of the tones/effects to see more details and adjust parameters.

All parameter changes you make will take effect immediately, but patches are not saved automatically to memory. Tap the icon in the top right corner to quickly write your changes to the current user patch, or tap the icon to write into a different user patch.

You can edit assigns by long-pressing the name of any parameter, or by navigating to the Assigns screen.