While using PWM0 and PWM1, sound (buzz) is played through the audiojack.
Is it possible to route audio not through PWM so it could be used at the same time as PWM?
The audio jack is driven by the hardware PWM peripheral.
You can use the hardware PWM peripheral to drive one or two channels (left and right) of audio or to drive one or two channels of PWM.
The choice is yours.