This video shows a homemade "drum" with velocity sensitivity. I used a simple piezo (under my mousepad) connected an audio input (can be a simple mic input) in my computer. The input is processed by REAPER running ProTrig (which converts the input to a MIDI note) and Addictive Drums VST plugins.

More details here (in PT-BR). With pictures:
[ Ссылка ]

*The tiny delay was a consequence of the youtube video conversion.

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