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