With the restrictive criteria,
The Gem Genesys xp (module)
Total integration between styles, SMS and Audio (wave and MP3 songs).
You can use the sampler to integrate your favorite sounds in to styles and sequences.
A full functioning 32 track sequencer and full style creation and editing.
Great sounds and sound editing.
Lots of storage space and a way to save lots of set-ups for different types of gigs.

It has a useable harmonizer.
you can view words to a song and the music on a screen.