Do you mean two pwm's on one joystick, because i don't think it's even possible to control one pwm with two joysticks. I mean, you could, but it would be rather pointless.
To control two pwm's with one joystick is easy:
serout [255,255,pwm1,relay1,pwm2,relay2,pwm3,pwm4...pwm16]
just replace which ever pwm with the variable of the joystick...
serout [255,255,p1_y,relay1,p1_y, relay2,pwm3,pwm4...pwm16]
if this makes no sense, sorry, but i'm typing this on like, no sleep, and well, it makes sense to me.
