[chuck-users] Midi time problem

Gonzalo gonzalo at dense13.com
Thu Dec 8 18:11:54 EST 2016

Thanks Michael,

This might be a bit over my head, but I'll look into it. Never checked 
Chuck's source code before, at the very least it'll be fun. :)


On 08/12/16 23:28, Michael Heuer wrote:
> On Thu, Dec 8, 2016 at 3:52 PM, Gonzalo <gonzalo at dense13.com
> <mailto:gonzalo at dense13.com>> wrote:
>     Hi,
>     I'm using Bruce Murphy's MIDIsender class
>     (http://www.rattus.net/~packrat/audio/ChucK/files/midisender.ck
>     <http://www.rattus.net/%7Epackrat/audio/ChucK/files/midisender.ck>)
>     to generate MIDI from my Chuck code. I'm sending this MIDI to
>     various virtual MIDI ports (using OSX's IAC Driver). Then I have
>     various software instruments in Cubase, each one listening to one of
>     the virtual ports. Works well when I run my Chuck program, but if in
>     Cubase I arm the tracks and try to record the incoming MIDI, all the
>     events get 'collapsed' at the same time, specifically the moment I
>     click record. They do get recorded, but all starting at the same time.
>     This only happens if I want to record them, if I'm only playing,
>     timing is fine.
>     Using MidiMonitor I see that the time for all the MIDI events
>     generated from Chuck is 0, that seems to be the issue. Any thoughts
>     on how I can change that?
> MidiMsg is defined as a four byte record
> https://github.com/ccrma/chuck/blob/master/src/midiio_rtmidi.h#L65
> but ChucK only sets three bytes on send
> https://github.com/ccrma/chuck/blob/master/src/midiio_rtmidi.cpp#L120
> midisender.ck <http://midisender.ck> does the same.  Is the unset byte
> supposed to be the time?  Suppose I should go read the spec.
> It appears time is written and read from files separately
> https://github.com/ccrma/chuck/blob/master/src/midiio_rtmidi.cpp#L823
> https://github.com/ccrma/chuck/blob/master/src/midiio_rtmidi.cpp#L837
> Not sure that helps,
>    michael
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