SinOsc sl => dac.left; // connect sine osc to dac left channel
SinOsc sr => dac.right; // connect another sine to dac right channel
200.0 => sl.freq; // assign 200.0 to the frequency of left sine
sr.freq(202.0); // assign 202.0 to frequency of right sine
5.0 :: second => now; // hang out for 5 seconds
204.0 => sr.freq; // set right sine freq to 204 Hz.
4.0 :: second => now; // hang out another 4 seconds