What are some alternatives?
When comparing NanoStudio and G-Stomper Studio, you can also consider the following products
Sampulator - Make (and record) beats on your keyboard
KORG Gadget - KORG Gadget - From iOS to Mac. Music production software to help your musical imagination become reality.
Caustic - Caustic is a music creation tool inspired by rack-mount synthesizers / samplers rigs.
Music Maker Studio - Android app to make music and write songs with a multi track Midi sequencer.
Cubasis - Cubasis is Steinberg’s streamlined, multitouch sequencer for the iPad.
Auria - Multitrack Digital Audio Workstation for iPad.