Controller Example Midigun 2
Check out the great gallery of projects that used this MIDI controller kit –

Pocket Electronic (abbreviation: “PE” in the following) is an universal electronics DIY kit to built your own MIDI control box. Up to 16 controlling elements can be connected to PE transmitting 16 different MIDI messages on different (or even the same) MIDI channels.

Essentially it contains the electronics core of Pocket Control resp. Pocket Fader but without the 16 controls (i.e. without rotary potentiometers resp. faders).

Instead of this PE is used to connect up to 16 controlling elements (e.g. rotary potentiometers, fader/slider potentiometer, touch switches, toggle switches, foot switches, foot controllers). The controlling elements are not included but have to be added by the customer. The MIDI data range is 0…127 with 7 bit resolution.

Pocket Electronics- Link.