Ok, first of all I have tried switching the non-functioning LEDs with the working ones and I get the same results. Secondly, the LEDs are connected to PWM pins 10,11,12,13 (from right to left); there is another connection on PWM pin 6 that leads to a resistor and the 2 capacitors and finally, the 2 potentiometers are connected to pins A0 and A1.
When I power up the board, I get no sound and I only get the 2 LEDs flashing. If I touch them, I get a low output of what it is supposed to be for one of them but a completely unrelated sound for the other. I have to touch them both in order to get sound from both of them.
I have downloaded all of the necessary libraries and I get no errors upon compiling.
Thanks,
Calin