Ok, Sorry... let me be more specific since I have learned most of the features from shopping online. I haven't made a purchase yet but I am leaning towards the SC880 because it is/has 32 track multitimbral thing. And it has 2 midi inputs. So I'm guessing it can handle two different midi signals at the same time, ie two sequences or two voices. Maybe I want one of my keyboards playing a B3 and the other a piano but I don't want it really layered or split. I have a Casio WK1800 and a Fatar SL880 for the moment. I would like it if the SC880 has a good B3 and a good Piano to maybe play chords on say the Casio keyboard triggering the B3 sounds and at the same time play a melody on the Fatar triggering piano sounds from the SC880. It seemes to me that a sound module with only one MIDI in can't handle this.
But I'm also concerned that the SC880's piano may not be as good as the JV1010.

I'd also like to peice together the Casio, the Fatar, the sound module and a computer. With two midi ins on the sound module, I can see in my head the setup I want that will:
1) Fatar (has two midi outs), 1 midi out to sound module midi in - Allows me to trigger the s.m. to play sounds in the s.m.
2) S.M. midi thru to the Casio midi in - allows me to trigger Casio sounds by playing the Fatar. At this point I can layer the s.m. and the Casio , right?
3) Casio midi out to computer's midi in. - allows me to send midi to computer for sequencing.
4) Computer midi out to 2nd midi in in s.m. - allows me to playback sequences through s.m. which should sound better than the Casio. And since the Fatar is plugged into the other s.m. in I think I could play along with the sequence with the Fatar and if I wish I can layer in the Casio.

Does this make sense to anyone? This is how I envision my home set-up.

Then if I wanna gig (which may be rare), All I would really gig with would be the Fatar and the s.m. I could bring along the Casio if I want to playback sequences. Or I could just bring the Casio and the s.m. Depending on the type of gig I may not need the 88 weighted keys ya know?

I was also wondering if there are some type of A/B switched for midi cables. Ya know like the old cable TV A/B swithes? A swith like that would give me even a little more flexibility at the flip of a switch.

Hey listen, I know I'm asking alot. But would really appreciate anyone's patience and help in the matter. Perhaps I can re-pay the favor somehow.

Thanks again!
RW