#36 Emulated 32X sound isn't loud enough

[Ant P]

The emulated 32X PWM sound is almost impossible to
hear, a real console is about 3 times louder.

I've tried fixing it myself by editing pwm.asm (I don't
know assembly language though :-/). Changing the two
"5"s at the bottom of that file to "6" makes it sound
better, but with some ROMs it causes sound clipping...