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MidiTapper - Midi Note Controlled Switch

Midi Keyed Trigger


  • • Midi Keyed Trigger
  • • RIP Håkan Müller

Video clips

Håkan Müller, creator of the Hamu devices passed away in May 2018. He suffered from ALS for 3 years and finally decided to leave. To honor Håkan, you can use his Rack Extensions for free from now on. Please remember Håkan when you are inking your rack purple.

MidiTapper lets you control buttons and knobs of your Reason devices by using any key on your MIDI Keyboard.

You can press, tap or double tap each MIDI key.

Pulse outputs with full ADSHR envelop.

Static toggle outputs with smoothing AR.

Three separate sets of on/off output levels.

Latest press velocity level S&H to separate output.

Product details


The MidiTapper is basically a button giving a control voltage output, which can be used for controlling many functions in your favorite Reason devices. Wherever there is a CV modulation socket for a parameter of device, MidiTapper can help you control that parameter. You can use it as a simple button, which at times is exactly what you need! Push the button to increase distortion, apply effects, add harmonic etc. Anything and all at the same time. Release the button and all the settings return to where they were before.


When you play, the closest control buttons to your fingers are the keys on you midi keyboard, and the keyboard usually automatically follows you when you change channel or track. With MidiTapper you can use any midi key you like, and I’m sure you can spare at least one from the 128 available, to control the simple button mentioned above.
In all honesty, this basic functionality can also be achieved by using features of a few Reason devices. Like Thor, as is elegantly shown by eXode in his ‘FX - Trigger Finger’ Combinator patch, in the free refill The Reason Toolbox. But MidiTapper offers so much more, and with a more functional GUI.


MidiTapper comes with loads of additional features, such as:

  • Press, tap and double tap (similar to usual mouse clicking), to trigger completely separate switches from same MIDI key.
  • NEW: Press will also sample and hold the tap key Velocity level to the Vel output.
  • Two parallel CV output shapes:
    • Envelope output (one shot pulse) with ADSHR
    • Static output (on/off switch) with AR
  • Three different output levels groups for ‘on’ and ‘off’ status, affecting all envelope and static outputs.
  • Learn button to select trigger key (‘Tap key’) from the midi keyboard.
  • Sequencer CV input, in parallel with MIDI, to trig CV output shapes.
  • Sequencer CV ‘Thru’ output, including - and ‘mingled’ with – the MIDI input.
  • Option to include the Tap key or not in outgoing sequencer CV.
  • NEW: Reset button to clear the midi 'gate on' counter and momentarily stop all output to thru sockets.
  • Color coded modulation input sockets for everything!
  • Color coded cable indicators up front, showing which sockets are used.
  • Plenty of meters and lamps for indication of signal status.


The tutorial video on the side is long, starting with a short presentation, followed by a more detailed description mixed with instructions how to set up a combi. Check the product page at for more, including feature details and printable documentation of the example instructions from the video, as well as a download of it's final combi.

Make sure also to check out the Mesher and ModSweeper devices from HAMU, see bundles. They will be the perfect companions for massive and precise control of your settings from your MIDI keyboard. This second video presents a setup where several HaMu CV devices are used to control octave and harmonics from a single midi keyboard.

More combinator patches are available from the HaMu pages.

Happy switching!




  • Added: Press velocity is sampled & held to new output socket.
  • Added: Reset button to clear any rare hanging thru gate.
  • Bugfix: Thru output now includes all notes played during sustain.


  • First release



Released: 2014-01-09
Version: 1.1.0