how could i make this signal go through both sides?

as of right now it is only coming through my left channel n id like to if not hear it in stereo, at least through both channels

you can duplicate it by adding ! 2 at the end :

play{a = PMOsc;b= SinOsc;d=440; a.ar(b.kr(0.1,d),d/2+b.kr(d*0.01,pi ),1,a.ar(4,2,1,0,a.ar(d*0.01,2,1)),b.kr(0.1)) ! 2}

or you can duplicate any parameter to have a different sound in each side (here with d) :

play{a = PMOsc;b= SinOsc;d=440 * [1,1.001]; a.ar(b.kr(0.1,d),d/2+b.kr(d*0.01,pi ),1,a.ar(4,2,1,0,a.ar(d*0.01,2,1)),b.kr(0.1))}