AmpliTube has a great of bass pedal for the iPad. There is also a free version also available. The full version has real time guitar and bass mobile multiFX app and a full rig made by 4 simultaneous stompboxes + amp + cabinet + mic.
There is low-latency for real time playing and includes tuner/metronome. In addition, 36 presets can be saved/named/recalled on the fly. AmpliTube contains 11 Stomps, 5 Amps, 5 Cabinets, 2 Mics expandable with 5 Stomps available through in-app purchase.
Import and play up to 50 songs to be used as backing tracks directly from your iPod library or computer. Slow down or speed up to tempo (-50% to +200%) of imported songs without affecting their pitch, as well. This will allow you to have the guitar/bass rig, a microphone, comprised of 4 recombinable simultaneous stompbox effects, and an amp-head plus cabinet.
Source: http://www.ikmultimedia.com/irig/moreinfo/moreinfo3.php.
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