Audio output
dac = T("dac", ...);
// ... Input objects which will be processed
dac = T("pandac", pan=0.5, ...);
// pan [Object]
// ... Input objects which will be processed
dac.pan [Object]
synth = T("saw", 880, 0.25);
dac = T("dac", synth);
dac.pan = T("+sin", 0.5);
dac.play();
synth = T("sin", 880).play();
// In fact, the above code is the shortcut, it's the same as below.
synth = T("sin", 880);
dac = T("dac", synth);
dac.play();
synth.dac === dac; // true
// A play() method creates a T("dac") object if it is not exists,
// and appends self to it, and T("dac").play().