First of all a word about gear: if you expect sound from the 1/8 headphone jack adapter to be as good as one going through the 30 pin digital, you are setting yourself up for disappointment and frustration. Trust me, you can hear and feel the price difference. I’m a bass player and have an iRig and an iRiffport. Actually, no, I just gave away my irig to a friend. Among Amplitube, Pocket GK, Mobile POD, Ampkit is my favorite. You get tons of tones, useful tools like a tuner and metronome, a simple recording interface, and my favorite: background audio/ ios multitasking. This basically enables you to dial in your tone, hit the home button and run a sheet music app like forScore or iRealb while still hearing yourself. Amplitube as a better 16 track recording interface but only works with the irig. And yes, Ampkit works with the iRiffport. The Trace Elliot sounds really good, but my big fingers have a hard time using the tiny 12 band EQ buttons!