PulseDPW super-efficient square-wave oscillator with low aliasing

PulseDPW.ar(freq, width, mul, add)

Use this just like the Pulse UGen - as with SawDPW, this uses the "Differentiated Parabolic Wave" technique to create a waveform extremely efficiently and with low (but not zero) aliasing.

freq - Frequency in Hertz (control rate)

width - Pulse width ratio from zero to one. 0.5 makes a square wave. This cannot be modulated.

This is actually a "pseudo-ugen" based on SawDPW rather than a separate UGen in itself, but is still very efficient. Compare the CPU usage in these examples:

// modulate frequency

{ Pulse .ar(XLine.kr(40,4000,6),0.1, 0.2) }.play;

{ PulseDPW.ar(XLine.kr(40,4000,6),0.1, 0.2) }.play;

// two band limited square waves thru a resonant low pass filter

{ RLPF.ar(Pulse .ar([100,250],0.5,0.1), XLine.kr(8000,400,5), 0.05) }.play;

{ RLPF.ar(PulseDPW.ar([100,250],0.5,0.1), XLine.kr(8000,400,5), 0.05) }.play;