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 Blind Control by Thomas Walther is a Mobile Audio App and a Standalone Application for iOS. It functions as a Standalone Application.
Blind Control
Blind Control Blind Control Blind Control Blind Control Blind Control
Product Blind Control
Developer Thomas Walther
Price (MSRP)
Type / Tags MIDI ControllerBlind ControlBlofeldSoftware MIDI controllerThomas Walther
Plug-in, App & Soundware Format(s)
UtilityStand-alone utility / application
Operating System Availability
Download Released
Downloads Released
Miscellaneous Information
Important Note
The app does not work with the Alesis iO Dock. Blind Control uses SysEx messages to communicate with the synthesizer. Despite it's manufacturer's branding, the Alesis iO Dock is not fully MIDI compatible and does not support SysEx messages.
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Blind Control is an iPad MIDI controller app for the Waldorf Blofeld synthesizer designed for live usage on stage. It features a multi-touch interface that allows keyboarders to control up to 10 parameters of their synth with one hand without looking at the touch area.


The app uses the full touch canvas of the iPad as one single touch area. By moving one finger horizontally or vertically, the user can control a pair of parameters. By moving two fingers horizontally or vertically, the user can control a different pair of parameters, and again three different pairs of parameters with 3, 4 or 5 fingers touching the screen. The app only measures the average distance that the fingers touching the screen travel - it does not take into account where the touch gesture started. This is very similar to a touchpad on a notebook. With this relative distance approach, Blind Control enables the keyboarder to use it blindly, and is explicitly designed for use on stage.


  • control ten parameters blindly with one hand.
  • seamless integration with the Waldorf Blofeld synthesizer.
  • conveniently select the parameters to be controlled from a nicely grouped list of named parameters (no MIDI numbers).
  • choose if you want to revert to the original value when you release your finger off the screen.
  • adjust sensitivity on the fly by moving only some of the fingers that touch the screen.
  • eight color coded presets.
  • allows you to control any parameter or load presets on the Blofeld at the same time without ever breaking synchronization.


Blind Control requires a MIDI connection to the Waldorf Blofeld synthesizer. The easiest way to do this is to use an Apple Camera Connection Kit and a standard USB-MIDI cable. The app will also work with any other connection, i.e. MIDI interfaces or using a computer between the iPad and the Blofeld, e.g. with USB cable and Bluetooth or WiFi connection. To eliminate the need of a computer, the use of the Apple Camera Connection Kit is highly recommended.

It is also highly recommended to put the iPad in a bordered case for the purpose of preventing the user from accidentally leaving the screen while swiping. Most leather enclosures for the iPad come with a frame that goes right to the screen borders.

More Information

This app is the result of the paper Rocking the Keys with a Multi-Touch Interface, Walther, Ismailovic et Bruegge, NIME 2013.

The touch interface method of Blind Control is currently pending patent.

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