Just listening to Fat Man in the Bathtub from the album Dixie Chicken by Little Feat.
It's awesome the way they can get such a convincing mexican trumpet sound on slide guitars. i'm starting to wonder how on earth they managed it.
More to the point, with modern effect pedals like the POG could this sound be recreated live..
Here's a snippit of the sound, you can hear it plainly at the end of the sample: http://www.amazon.com/Dixie-Chicken-Little-Feat/dp/B000002KEP