Take a 3.5mm to red/white aux cable and cut It right at the RCA jacks. Solder the red RCA side to the Rch W pin in the picture and the white RCA side to the Lch W pin in the picture. twist the two bare copper wires together and solder them to either the Lch or Rch negative pin. Make sure that the ne...

Dang! This site is awesome! I did the mod, and put in my Hello Nasty cassette and plugged my Xperia in the jack and it cut the tape out and played my phone. Had an inline modulator before this.... Its like VHS compared to BluRay. Glad I didn't spend the 140 for the GROM BT3. Awesome write up.