Easiest way i could think about doing it would to use the lleft and right wiring of the rradio so the audio out of the radio would be replaced by an aux in jack, or ahould i take everything out except the speakers, put in my own power system and amp,arduino as my controller, and even bluetooth shield, still kinda noobish but if anyone wants to help me i could post some pictures of the boom box disassembled, but im fairly certain ive located the radio part and and maybe the radio audio out,
(also want to put one of those led matrix sound level bar things in the radios window, to give it a cool vibe since i pooped up the tuning system :3 )
*and the dual cassete deck was broken so lots of empty sapce and room to play around