In the example ,var a =dust ,is left channel only
B=Sinosc is an array , this left+right
Adding a+b , dust is now also on botch channels
How come ?
Is is becasue dust is added to each element in the array , [sineleft,sineright]+dust=[sineleftdust,sinerightdust]
////
(
{
a=Dust.ar(1000)*0.5;
b=SinOsc.ar(110)!2;
a+b;
}.play
)
////