The real-time knobs really help with the editing. The LCD is kinda small, but it's useable and has adjustable contrast. Let me talk about the sounds some more. Easy manual, reminded me of a dummies book. Built in reverb and multi-effects.
Expansion is in the form of connecting a kick pedal and a hi-hat pedal.
Pads are velocity sensitive and pressure sensitive. Will TX on any MIDI channel. The sequencer has 4 tracks. Sequencer programming is done in patterns, although you can define a very long pattern and just play a whole song into it. There are about 500 sounds but with the editing you won't run out too soon as you can take any instrument and deform it into something else.