Can't hear my frequency modulation

Questions Code Review
1

Yet another beginner puzzled here: I am confused why I can’t hear anything from the code below. Can any one help me spot the problem please? Thank you!

(
{
	
	var ctl = LPF.kr(LFPulse.kr(2), 200);
    Saw.ar(ctl,mul:0.2,add:400).poll
	
}.play;
)
2

Your add:400 isn’t doing what you think it is. It’s pushing Saw to oscillate +/- 0.2 at the 400 line, instead of being centered around 0.

You should add the 400 to the modulating oscillator in ctl

(
{
	
    var ctl = LPF.kr(LFPulse.kr(2, add: 400), 200);
    Saw.ar(ctl,mul:0.2).poll
	
}.play;
)

var ctl = LPF.kr(LFPulse.kr(2), 200) + 400; should also work.