i recently came across this a couple year's back.
as i saw someone playing his ipod doing a cover for his Guitar. plugged to his amp.
and now that i have some new equipment, those past 2 years shows how late i am to see into it.
Things to need:
Dual Sided 3.5mm(or 3.5mm to 6.3mm cord)
|/\| OR |/\|
Dual Sided 3.5mm cord + 3.5mm-to-6.3mm adapter.
a Guitar Amp with a overdrive/clean switch
Ipod. any kind.(i recommend 5th gen Classic)
and good music.