Just a guess, but if you are outputing signal to the dac in more than
one shred you'll have to normalize output gain - otherwise the sound
will clip.

Compare how these two examples sound, (use two shreds doing the same
of each example):

// example 1
SinOsc s => dac;
440 => s.freq;
2::second => now;

// example 2
SinOsc s => dac;
0.5 => s.gain; // normalize gain
440 => s.freq;
2::second => now;

Hope to have helped.
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