complete control of Reason from iOS or Android


RetouchDuo is a complete set of layouts for TouchOSC MK1 to control Reason from iOS or Android mobile devices. It features:

  • bidirectional communication with parameter and text feedback
  • dedicated pages for native devices like Europa, Grain and Thor
  • generic page for most other devices, Rack Extensions and VSTs (see list here)
  • step-sequencer for Kong with pattern storage
  • full control of the Redrum step sequencer
  • note repeat automatically synced to the song tempo and chord memory function to play 1-finger chords
  • easy integration with a MIDI keyboard or pad controller
  • Bonjour/ZeroConfig connection between your device and the computer via WiFi
  • layouts for both tablets and phones which can be customized in the TouchOSC Editor

Please note, RetouchDUO is NOT compatible with the MK2 version of TouchOSC. Make sure you have the TouchOSC MK1 app from the App Store or the Google Play Store.


The layouts

If your device is capable of running the TouchOSC MK1 app, then you can use the RetouchDuo layouts. They will scale to best suit the size of the device. There are versions for both tablets and phones.

For the phones, there are two types to accommodate both smaller and larger phone sizes.

Furthermore you can customize the layouts using the free TouchOSC Editor, if you wish to do so.

For more details about the control pages in each layout version, please visit the “Tablet” and “Phone” tabs.

The server app

On the computer side, the RetouchDuo server app for both Mac and Windows handles all the communication between Reason and TouchOSC.

It uses the Bonjour/Zeroconfig auto discovery feature to find any device on the same WIFI network and it connects to it with a simple click. Up to two mobile devices can be connected at once.

For iOS devices, it is possible to use a wired connection for ultra low latency OSC via the USB charging cable when connected to the computer. This requires the installation of the StudioMux app and server application from zerodebug. Please consult the user guide for more information.




  • TouchOSC MK1 app from the Apple App Store or Google Play Store
  • Reason 6 or later, compatible with Reason 12 in standalone mode
  • WiFi connection: for best performance, use an “ad hoc” network between computer and mobile device

Mac Requirements

  • Mac OS X 10.11.6 or later (compatible with Sonoma)
  • Use the native IAC bus to create virtual midi ports (see the Installation tab for details)

Windows Requirements

  • Windows 7 / 8 / 10 / 11
  • Installation of LoopMIDI to create virtual MIDI ports (see the Installation tab for details)
  • Installation of the Java Runtime 8 64bit from Oracle (used for the key commands)

Installation Tutorials

Mac OS Instructions
Windows Instructions
How to install LoopMIDI (Windows)
How to create IAC ports (Mac)