I sold my amp several years ago when moving, and I have been missing it more and more. I have never used one of these phone-guitar interfaces, but it seems very attractive to me to get fairly good sound effects from an application directly into my headphones.

I have a Boss RC-30 from my old band-playing days, and I love jamming with myself with that one. But can I use it normally with these interfaces? I imagine I could just connect it in-between the phone and my guitar, but would it work?