{(SinOsc.ar(440) + SinOsc.ar(140)).dup * 0.1}.play;
{ (SinOsc.ar(440, 0) + SinOsc.ar(140, 0)).dup * 0.1 }.play;

(
{
    var phasor = Phasor.ar(0, 40 / SampleRate.ir, 0, 1); // base phase
	var sig = SinOsc.ar(0, phasor * 2pi) + SinOsc.ar(0, phasor * 2pi * (SinOsc.ar(640)));
    sig.dup * 0.1
}.play;

)