<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">The tempo in BPM is what drives the <a href="https://github.com/heuermh/lick/blob/master/lick/duration/TimeSignature.ck" class="">TimeSignature class in LicK</a>, for example a 4/4 kick drum<div class=""><br class=""></div><div class="">RolandTr808 rolandTr808;</div><div class="">TimeSignature.common(120) @=> TimeSignature ts;</div><div class="">ts.quarterProvider() @=> QuarterProvider q;</div><div class=""><br class=""><div class="">spork ~ Loops.loop(rolandTr808.kickE, q).run();</div><div class=""><br class=""></div><div class="">// wait a minute, then change the tempo to 110 BPM</div><div class="">1::minute => now;</div><div class="">110 => ts.tempo;</div><div class=""><br class=""></div><div class="">// wait another minute, then decelerate the tempo by 0.8 over the next 30 seconds</div><div class="">1::minute => now;</div><div class="">spork ~ ts.decel(0.8, 30::second);</div><div class=""><br class=""></div><div class="">etc.</div><div class=""><br class=""></div><div class="">If I can calculate the BPM from external clock, then I can adjust the BPM in the TimeSignature class as it is running.</div><div class=""><br class=""></div><div class=""> michael</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 2, 2019, at 4:37 PM, Mario Buoninfante <<a href="mailto:mario.buoninfante@gmail.com" class="">mario.buoninfante@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">about receiving external clock, I think the goal there is to use the clock to drive the algorithm.</div><div class="">I wouldn't try to calculate the BPM if not for just displaying it somewhere.<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 2 Jul 2019 at 22:17, Michael Heuer <<a href="mailto:heuermh@gmail.com" class="">heuermh@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">All,<br class="">
<br class="">
I'm curious how to use MIDI clock effectively in ChucK, in two main use cases:<br class="">
<br class="">
From a sample-rate-based timer in ChucK, how should I send out MIDI clock?<br class="">
<br class="">
while (true) {<br class="">
10::ms => now;<br class="">
// send MIDI clock<br class="">
}<br class="">
<br class="">
or<br class="">
<br class="">
TimeSignature.common(120) @=> TimeSignature ts;<br class="">
<br class="">
while (true) {<br class="">
ts.e => now;<br class="">
// send MIDI clock<br class="">
}<br class="">
<br class="">
or (this one allows the caller to modify the tempo later)<br class="">
<br class="">
TimeSignature.common(120) @=> TimeSignature ts;<br class="">
ts.eighthProvider() @=> EighthProvider e;<br class="">
<br class="">
while (true) {<br class="">
e.evaluate() => now;<br class="">
// send MIDI clock<br class="">
}<br class="">
<br class="">
<br class="">
From receiving MIDI clock messages from an external source, how should one adjust the BPM in ChucK?<br class="">
<br class="">
MidiIn min;<br class="">
MidiMsg msg;<br class="">
<br class="">
TimeSignature.common(120) @=> TimeSignature ts;<br class="">
<br class="">
while (min.recv(msg)) {<br class="">
// if is clock … {<br class="">
/* new BPM */ => ts.tempo;<br class="">
}<br class="">
}<br class="">
<br class="">
I would imagine I would want to window over the last n clock messages to average?<br class="">
<br class="">
Thanks in advance,<br class="">
<br class="">
michael<br class="">
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