this might help you a bit
This is with just ONE LED Tried to make it as simple as possible for your benefit:
DO NOT HAVE MORE THAN ONE (1) SWITCH TURNED ON UNLESS YOU HAVE RESISTORS BECAUSE THE COMBINED VOLTAGE COULD POSSIBLY BURN OUT YOUR LEDs.
THE POWER BOARD AND SPEAKERS ARE 3.6V (PSP USES THAT VOLTAGE FOR EVERYTHING (I BELIEVE) BECAUSE THAT IS THE VOLTAGE OF THE BATTERY...
SPEAKER VOLTAGE + POWERBOARD VOLTAGE = 7.2v AND THE LEDs USE 3.6V MAX (I THINK, DO YOUR RESEARCH)