MIDI monitor only accepted midi data and output that same data. That was
logical for a MIDI plugin, but a consequence is that automatic pin
configuration makes MIDI monitors opaque to audio data, which means
drag'n'dropping a MIDI monitor for debugging purposes can suddenly cut
audio, or even change the channel count if strict I/O is enabled.
Improve the MIDI monitor so that it passes through all incoming data
unchanged.
This plugin lets through all incoming MIDI events, and also shows the
latest ones in a human-readable format directly on the mixer strip. The
user can choose the font size and the number of recent events displayed,
as well as whether to print values in decimal or hexadecimal, and
whether to print system events.
