Dave Smith Instruments SYNTHESIZERS

I'm having trouble figuring out how to program my Edirol PCR-50 to transmit sysex 
messages to the Evolver for parameter changes.

I've been looking for sysex info on the net, and I've read both manuals, but it doesn't make 
any sense to me.

Anybody know of any good books or resources to learn about sysex messages?

Thanks!