The tempo in BPM is what drives the TimeSignature class in LicK, 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 <mario.buoninfante@gmail.com> 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 <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
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