A simple 1 octave (1 to 2 volt) stylo eurorack keyboard.
Just use a patchcable on the upper jack. Connect the CV and Gate outputs to the modules of your choice and play with the ‚stylus‘-patchcable on the keyboard.

https://xor-electronics.com/product/freestylo/

• 6hp
• 5 mA +12V
• 0 mA -12V
• 0 mA 5V
• 14 mm deep