understood. thank u On Tue, Sep 25, 2012 at 9:48 PM, Jeff Albert wrote:

Try this:

SinOsc s => dac;

while(true) { .2 => s.gain; 220 => s.freq; 2::second => now; 0 =>s.gain; 2::second => now; }

-- Jeff Albert Assistant Professor (Extraordinary) of Music Industry Studies Loyola University New Orleans Office: Communications/Music Complex 428P Office Phone: (504) 865-2606 Google Voice: (504) 315-5167 jvalbert@loyno.edu http://www.loyno.edu/~jvalbert

On Tuesday, September 25, 2012 at 2:36 PM, Alberto Alassio wrote:

SinOsc s => dac; .2 => s.gain; 220 => s.freq; while ( 2::second => now) 0 =>s.gain

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

Yeah, now it's clear. thank you very much On Tue, Sep 25, 2012 at 9:58 PM, Rich Caloggero wrote:

If I just want to do a really stupid thing like a Sine at 220 Hz that

...

sounds for 2 seconds and then stops for 2 seconds and then goes again. How could I do?

// define connection

SinOsc s => dac; .2 => s.gain; 220 => s.freq;

// now we let the machine run for two seconds producing the sine wave 2::second => now;

// now we let it run for two seconds, producing no sound

0 => s.gain; 2::second => now;

// ... and again for two seconds producing a tone .2 => s.gain; 2::second => now;

The secret is in the "=>' operator. Its not strictly an assignment when its second argument is the now keyword. What this is doing is essentially suspending your code for the indicated amount of time and letting the Chuck virtual machine compute the samples and send them to the dac.

When you use looping is when you want to modify some of the parameters of the thing being computed in realtime. In that case, you generally loop and each time around the loop you change parameters, then set now to some value, say .1 second. This then would suspend your code for .1 seconds each time around the loop. When your code regains control, you change parameters and then suspend it again and let Chuck compute. So, for instance:

// using same connection graph as above:

while (true) { s.freq + .1 => s.freq; .1::second => now; } // while

Hope this helps ... -- Rich

From: Alberto Alassio Sent: Tuesday, September 25, 2012 3:36 PM To: chuck-users@lists.cs.**princeton.edu Subject: [chuck-users] Looping

I cannot understand how the while structure has to be used. I mean, I understood that while ( true ) means infinite loop and also that while ( n::second => now ) means an "n" second loop duration but...

If I just want to do a really stupid thing like a Sine at 220 Hz that sounds for 2 seconds and then stops for 2 seconds and then goes again. How could I do? I thought that it was necessary just to do something like this

SinOsc s => dac; .2 => s.gain; 220 => s.freq; while ( 2::second => now) 0 =>s.gain

but I know that it's not the right way, also because in this method I would have to rewrite this thing an infinite ( whiletrue ahahah) number of times to have what I'm looking for.

And I don't actually understand {} . How am I supposed to use these?

Thanks

______________________________**_________________ chuck-users mailing list chuck-users@lists.cs.**princeton.edu https://lists.cs.princeton.**edu/mailman/listinfo/chuck-**usershttps://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-**usershttps://lists.cs.princeton.edu/mailman/listinfo/chuck-users

Ok for the first example, I did that by myself but don't know why it wasn't running but that is what I did, maybe I've just forgotten some ";" or whatelse! Thank you! I don't understand the second one with FOR, what is i++? How would you say that line command? For i starting from 0 then make the sound till i is equal to 10 then stop?

Thank you another time On Tue, Sep 25, 2012 at 10:28 PM, Michael Heuer wrote:

Alberto Alassio wrote:

...

Ok for the first example, I did that by myself but don't know why it wasn't running but that is what I did, maybe I've just forgotten some ";" or whatelse! Thank you! I don't understand the second one with FOR, what is i++?

i++ is "add one to i"

...

How would you say that line command? For i starting from 0 then make the sound till i is equal to 10 then stop?

Yes, that is correct.

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

Alberto Alassio wrote:

but what if I want to do this with 2 sines?

I mean, for example

Sineosc s1 that sounds and stop the same freq every 2 second, and another Sineosc thats sound at the same freq every 1 second I can use while true and put everthing in the bracklets. Right? Is it possible to do the same thing also with the For structure you mentioned?

And what about

sineosc s1 at 220 hz that goes on and off every 2 seconds sineosc s2 that has a random frequency ( std.rand2f for example ) How could I manage this situation with while? I need while ( true ) to make it in an infinite loop but I also need to make the random freq goes on!

If you do this SinOsc s1 => dac; 220.0 => s1.freq; for (0 => int i; i < 10; i++) { 0.2 => s1.gain; 2::second => now; 0.0 => s1.gain; 2::second => now; } SinOsc s2 => dac; for (0 => int i; i < 10; i++) { Std.rand2f(130.0, 440.0) => s2.freq; 0.2 => s2.gain; 2::second => now; 0.0 => s2.gain; 2::second => now; } then s2 will follow s1. If you want them to go simultaneously, then you'll need to put one or both loops in a function and spork the function call, for example SinOsc s1 => dac; 220.0 => s1.freq; spork ~ loop1(); SinOsc s2 => dac; spork ~ loop2(); <<<"waiting on main shred">>>; 2::minute => now; fun void loop1() { <<<"sporked loop1">>>; for (0 => int i; i < 10; i++) { 0.2 => s1.gain; 2::second => now; 0.0 => s1.gain; 2::second => now; } <<<"loop1 done">>>; } fun void loop2() { <<<"sporked loop2">>>; for (0 => int i; i < 10; i++) { Std.rand2f(130.0, 440.0) => s2.freq; 0.2 => s2.gain; 2::second => now; 0.0 => s2.gain; 2::second => now; } <<<"loop2 done">>>; } michael

Ok, I have other questions for you! What if I want to loop these loops? I mean, you wrote 2 loops going together that stop when i arrives to his maximum. If I'd like to make something like = s1 and s2 go till i reaches his maximum, then stop for 2 seconds and then restart again. Maybe I could use while (true) to make it? I was trying but I couldn't find a good way to make it. Or maybe I have to make another spork that is a loop containing the others 2 loops?