Thanks for offering help. I'll figure out a manner to get away with a deattachable solution that greets my eye. I think that the reason for no engine noise is the low output (watts) of the iPod (unlike most OEM HU), also the quality of the amp plays it role. Very happy to hear that you can actually get away with that, many motorcycle tunes I've heard have that annoying background engine noise.
Thanks for sharing, you reminded me of that pending project for my ride.
Mimo.