A while back I dug up some info on AUX input options. Tape adapter, FM modulator, all garbage. Eventually found a diagram by Jeff Anderson which takes advantage of the 13-pin CD plug in the back of the Type 1 radio. Posted a DIY thread here. I wired this up with a cheap toggle switch a few months ago, and it worked but some contacts weren't being made in the switch itself, so I decided it was time to step up the quality a little.