Thank you for your words.
Have you looked at the Boss Micro ?. the vocals where recorded with the on-board mic, and you can get lots of FX, so you can record any sound that you want, including a tuba.
When I play live I also have a bunch of stuff, mixers, amps, mics and FX, but with the Boss, it is just me and the guitar, I have eveything I need in one small box, it fits into a PS2 case, I look at the boss as a stand alone studio, yes it takes some working out, but I will share my limited skills with anyone who is intrested, and the cost of the unit was a big selling point to me.
Good luck with your recording.