dac.left => WvOut wL => blackhole;
dac.right => WvOut wR => blackhole;

4::second => dur l;
now + l => time later;
"./wavs/rec2L.wav" => wL.wavFilename;
"./wavs/rec2R.wav" => wR.wavFilename;

<<<"writing to file: ", wL.filename()>>>;
<<<"writing to file: ", wR.filename()>>>;

while ( now < later )
	500::ms => now;

wL.filename() => wL.closeFile;
wR.filename() => wR.closeFile;
<<< "rec2 done." >>>;