Triggering event - anonymous functions (like in Javascript)

[Frederic]

Hello all, 

 

I'm coming from the javascript development world. Here are few musical ideas. Is there a way to implement them thanks to Opusmodus ? 

 

- play a sequence of notes in 30 seconds:

in javascript, it could be pseudo-coded like this: 
 

 setTimeout(function(){ play('c4 d4 e4 f4 g4'); }, 3000); 

 

- play a sequence of notes at a specific event.

in Javascript/jQuery, it is very easy to code anonymous functions that would wait for a specific event to be triggered. Some examples I have in mind:

 

play 'do ré mi' at bar 4

$('4th bar').on(function() { play('c5 d5 e6');});

 

play 'do ré mi' each time note f5 is played

$('f5').on(function() { play('c5 d5 e6');});

repeat the note + octave when f5 is played

$('f5').on(function(this) { play(this + this.octave(1));});

 

In other words: is it possible to trigger an anonymous function with opusmodus, so that a musical phrase will be played at specific event ? 

 

 

Thanks for clarification, best !

[opmo]

SLEEP is the function you are looking for.

(sleep time) ; in seconds 

 

The 1st expression will play for 10 second. The 2nd for 4 seconds.

(progn
  (ps 'gm :cl (list (gen-repeat 100 '((s c4 d4 e4 f4 g4)))))
  (sleep 10)
  (ps 'gm :fl (list '(q c5 d5 e5 f5 g5 a5 b5)))
  (sleep 4)
  (ps 'gm :fl (list '(w cs6)))
  )

 

[AM]

but SLEEP is not very precise - would be nic to have in OPMO a real precise trigger, like with OSC (for external players...)

 

 

 

 

[opmo]

very precise:

(sleep 0.645)

 

[AM]

the NUMBER is precise, but ...  

 

...but the great thing is, you are very flexible (and open) in OPMO/lisp... and you can trigger also other software/externals from OPMO/lisp  via OSC, i LOVE IT

 

 

[opmo]

Every function which use a time wait (Threads, OSC and other libraries) using SLEEP - very precise indeed. 

[AM]

my colleagues from the computermusic laboratory advised me not to steer external things via internal SLEEP, but also to control the TIME / delay via OSC. perhaps also has to do with the fact that for me different things must be controlled in parallel and synchronized. i don't know...

[Frederic]

Hello,

 

Ok thanks ! I understand how to mitigate my first use case with SLEEP.

 

But what the second one ? how to play a musical phrase at specific event, like for example when "f5" is played 

 

Thanks again ! 

[Stephane Boussuge]

you have many way to do that in OM, have a look to pattern-map for example or substitute-map...

 

SB.

[torstenanders]

> but SLEEP is not very precise

 

The Common Lisp standard actually says that the number of seconds specified as arguments for sleep is approximate:

 

> Causes execution to cease and become dormant for approximately the seconds of real time indicated by seconds, whereupon execution is resumed. 

 

CLHS: Function SLEEP

WWW.LISPWORKS.COM

 

Anyway, it seems that at least on a Mac the imprecision is rather regular, see the following discussion with empirical tests.

Time to sleep under different platforms

LISP-HUG.LISPWORKS.NARKIVE.COM

 

Anyway, for realtime scheduling in a musical context one needs likely a proper scheduler for that. 

 

Best,

Torsten

[AM]

thanks!

a.

p.s. 

Quote

Anyway, for realtime scheduling in a musical context one needs likely a proper scheduler for that. 

... that's why i have some other solutions for my needs...