Debugging MIDI

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You can use “jack-smf-utils” for recording the MIDi input stream to a standard .mid file.


You should download this file to your Zynthian (zynthian/zynthian-sw folder is a good place) and build and install the package. Something like this:

cd /zynthian/zynthian-sw
tar xfvz jack-smf-utils-1.0.tar.gz
cd jack-smf-utils-1.0
make -j 4
make install


Regarding the usage, it’s pretty easy.

For recording from the first USB-MIDI port:

jack-smf-recorder -a system:midi_capture_1 p.mid

For recording from the MIDI-IN standard port:

jack-smf-recorder -a ttymidi:MIDI_in p.mid

For re-playing the recorded file to the Zynthian MIDI router:

jack-smf-player -a Zyncoder:input p.mid

If you take a look to the jack connection graph, you will see different ways of short-cutting the system, and make some interesting tests by yourself. For instance …

Recording the MIDI stream from the Zynthian MIDI router output:

jack-smf-recorder -a Zyncoder:output p.mid

this is the MIDI stream after being processed by the Zynthian MIDI router/filter