Basically a JV-90 with more keys and a Sequrencer. Some sounds are good, others awful.
The JV-1000 is a mix of a JV-90 Synthesizer and a MC-80 Sequencer. It features a 76 semi-weighted keyboard, sturdy metal chassis and 9 assignable sliders. Can house VE-GS1 Expansion card. the 8 sliders are assigned to parameters by page; it also got a MIDI-assignable slider, thanks this and the separeted sequencer output, works very well as MIDI controller. Its sound aren't any special... just some standard Roland '90 sample but you can squeeze out some really great strings and pads, acoustic sounds are awful instead. Filters are quite useless as also the effects (only 3 Reverb, 3 Chorus and a Delay). Summarizing, it has great possibilites as MIDI controller or also backing keyboard
EDIT: after a few time spent scratching and tweaking its default sounds you can use a bunch of them, I like a lot the "St String" sound, very rich and warm but still with a digital point, also pads and leads are usable. but in my opinion its greatest sounds come from the string section