I think that u can look in theyre site for a comparison chart... I know Sl 1.0 to SX 1.0 had a few differences like the mixer didn't show as many parameters but u could still access them thru other windows/ ways.

Also there is a limit 2 the amount of instruments/ audio Tracks/ inserts/ efxs that u can use.. but I gotta tell ya it's preatty resonable and more then enought!!

Z