Ports

Input

Output

Listen to every input at once Ask for SysEx permission

Web MIDI needs Chrome, Edge or Opera. SysEx permission is asked for once, and is what a dump needs to get through.

Demo instrument

Pretend to be

A simulated instrument playing into the monitor, for trying the filters, the plotter and the keyboard without hardware — and in browsers with no Web MIDI at all.

Show

Channels

SysEx

Bytes to send

Gap between messages (ms)

Dumps from a synth are captured as they arrive. Old instruments need the gap when a file is sent back to them.

Traffic

Not connected in 0 out 0 clock — 0 held only matches

Channel Velocity Bottom octave CC64 Program Bend0 Clockbpm