Re: [chuck-users] how to use MIDI clock in ChucK

The tempo in BPM is what drives the TimeSignature class in LicK https://github.com/heuermh/lick/blob/master/lick/duration/TimeSignature.ck, for example a 4/4 kick drum RolandTr808 rolandTr808; TimeSignature.common(120) @=> TimeSignature ts; ts.quarterProvider() @=> QuarterProvider q; spork ~ Loops.loop(rolandTr808.kickE, q).run(); // wait a minute, then change the tempo to 110 BPM 1::minute => now; 110 => ts.tempo; // wait another minute, then decelerate the tempo by 0.8 over the next 30 seconds 1::minute => now; spork ~ ts.decel(0.8, 30::second); etc. If I can calculate the BPM from external clock, then I can adjust the BPM in the TimeSignature class as it is running. michael

On Jul 2, 2019, at 4:37 PM, Mario Buoninfante wrote:

about receiving external clock, I think the goal there is to use the clock to drive the algorithm. I wouldn't try to calculate the BPM if not for just displaying it somewhere.

On Tue, 2 Jul 2019 at 22:17, Michael Heuer mailto:heuermh@gmail.com> wrote: All,

I'm curious how to use MIDI clock effectively in ChucK, in two main use cases:

From a sample-rate-based timer in ChucK, how should I send out MIDI clock?

while (true) { 10::ms => now; // send MIDI clock }

or

TimeSignature.common(120) @=> TimeSignature ts;

while (true) { ts.e => now; // send MIDI clock }

or (this one allows the caller to modify the tempo later)

TimeSignature.common(120) @=> TimeSignature ts; ts.eighthProvider() @=> EighthProvider e;

while (true) { e.evaluate() => now; // send MIDI clock }

From receiving MIDI clock messages from an external source, how should one adjust the BPM in ChucK?

MidiIn min; MidiMsg msg;

TimeSignature.common(120) @=> TimeSignature ts;

while (min.recv(msg)) { // if is clock … { /* new BPM */ => ts.tempo; } }

I would imagine I would want to window over the last n clock messages to average?

Thanks in advance,

michael _______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu mailto:chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users https://lists.cs.princeton.edu/mailman/listinfo/chuck-users _______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users