CrossRoads:
Can you get the 7.2V out to the LEDs? Then you can have little strings of 2 or 3 in parallel (color dependent) cut down the current requirements by 2 or 3, get more life from a battery charge.
i don't understand much the suggestion... anyway we need the 4 strings linked to digital pins to turn them gradually on
this the updated scheme, with the sound board, mini-amp, speakers and accelerometer added.
so in the part list i added:
1x WT5001M02-28P mp3 sound board
http://www.aliexpress.com/item/Free-shipping-WT5001M02-28P-MP-s-most-competitive-high-quality-voice-module/1135016430.html
1 X ADXL335 3-axis Analog Output Accelerometer Module
http://cgi.ebay.it/ws/eBayISAPI.dll?ViewItem&item=130748423701
1 x mini amp PAM8403
http://www.ebay.it/itm/181303482967?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649