IK has released this free App for a complete professional guitar & bass multi-effects processor for all Android smartphone and tablet devices.
http://www.ikmultimedia.com/products/amplitubeua/ Universal Android processing
IK say that to get the most out of AmpliTube UA, it needs to be paired with the forthcoming iRig UA digital audio interface (due out in May). The combination of iRig UA and AmpliTube UA delivers universal zero latency processing and high-quality sound on the Android platform. Together they give musicians the ability to play in real-time with no audible device processing delay. This previously impossible feature is now a reality due to iRig UA's built-in high performance 32-bit DSP, 24-bit A/D converter, 44.1/48kHz sample rate, and low-noise instrument preamp.