SndBuf buf => dac;
"sample.wav" => buf.read;

float	srate, duration;
1 => buf.gain;

for ( 0.7=>srate; srate<1.8; 0.1 +=> srate) {
	900 / srate => duration;
	<<< "loop...", srate, duration >>>;
	0 => buf.pos;
	srate => buf.rate;
	(duration)::ms => now;
}