For information on how to get the best sounds out of your x0xb0x, see UsingTheSynth. For information on how the sequencer works, see UsingTheSequencer.
The x0xb0x has 7 major modes of operation, plus 3 "user" modes of operation which, if you are willing to hack the FirmWare, you can make it do whatever you like.
MidiPlay - Play the x0xb0x through an external sequencer
KeyboardMode - Use the keyboard keys to play notes
RandomMode - Play a constantly changing random sequence
PatternMode - Play or Edit a single bar pattern
TrackMode - Play or Edit a series of single bar patterns
BootloadMode - On startup, set up the MicroProcessor to be reprogrammed
ComputerControlMode - Edit patterns from your computer
UserMode