I have several questions regarding the PR703, but my first one is this: I've hooked up a Yamaha Motif-rack ES sound module to the technics. I'm trying to use the technics sequencer to record from the ES & it's not working. The technics will only record it's own sounds. Can anyone give any suggestions as to what to do? Any help is very much appreciated.

The sequencer only records data, not audio.
The internal sequencer is defaulted to play back the keyboard sounds..You should be able to midi out of the keyboard to the rack mount..You probably will have to change a parameter on the keyboard to allow the sequencer to play out of the midi connection..