[Denemo-devel] MIDI messages from denemo to qsynth via JACK

[Richard Shann]

Here are some notes about denemo's jackmidi output, just in case they
may be useful to anyone.

I have been looking that the qsynth message output when denemo plays the
note middle c 
This is with my experimental denemo compiled with the "setting of the
channel to 0 code", that I mentioned yesterday, omitted:

fluidsynth: noteon      1       60      65      00009   146.239 146.237 0.000   
2
fluidsynth: noteon      1       60      65      00009   146.239 146.237 0.000   
3
fluidsynth: noteoff     1       60      0       00009   147.238 147.236 0.998   
2
fluidsynth: noteoff     1       60      0       00009   147.238 147.236 0.998   
2

The output seems to mean:

noteon/off  channel  midinote velocity unknown_counter time time time-delta 
unknown

e.g.

noteon      1=channel        60=middle c  00009=unknown 146.239=time_secs 
146.237=time 0.000=time_delta_secs 2=unknown

there seem to be two noteon and two noteoff messages for each note.

In jackmidi.c the notes are sent

        /* First, send it via midi_out. */
one of these reserve buffer things
and then
        /* Send it via proper output port. */
another of these reserve buffer things

but commenting out one or other of these outputs results in either silence or 
two noteons and two noteoffs, most unexpected!


Richard