TBD Eurorack Module – Back in stock!


  • Make sure IO-App has MIDI access rights. Then connect IO-Lights and reload website.
  • Changes are applied in real-time. To persist them, use the button at the bottom.

Online Synths:

Click/Tap on a synth to open it in a new tab

midi.city Websynths Microtonal webCZ-101


MIDI Notes

Light Sensor
Automatic Brightness Adaption

MIDI Control Change

Visualize MIDI CC

CC Slew Limiter

Random Mode

Touch Notes
Touch Controller
Clock Sync

Note Hold

IO-Lights not detected