Now it's time to make this thing sing. I used 2 spy ear toys just like the ones in the picture, and removed the cases and microphones. where the microphones used to be attached you need to attach an audio jack. this is sound in. where the headphones jack is becomes sound out. after attaching a jack to one, find a way for it to get outside the machine. this will be for mp3 players, ds's, ipods, etc. plug the speaker into it. solder wires to the positive and negative battery terminals. put the negative wire into the -5v part of the power plug. this wire is the one next to the red wire. do the same for +5v, except using the red wire instead. if you want, you could use 12v, but I used that for the cd player. do the same for the cd player's amp, and find a 90 degree plug to plug into the cd player, and attach to the amp. i just soldered a headphone plug instead. now get a jack and attach it to the built-in speaker. plug it into the cd player's amp. you now have created an amplifier. of course turn the volume to max on the amps, and just a little up on the cd player itself. for mp3 players, the volume can be at about 4/5 max, because they don't put out as high of a frequency sound.