I would like to know what the difference is between the "GM" and "GS" designations are. I know what the GM soundset is, having this on several midi instruments. I believe GS allows for additional controller messages to be accessed through a computer software sequencer or editor (control messages that are not normally accessible through GM parameters). But I have read that a GS module has access to 317 sounds versus the 128 GM sounds. Are there in fact this many sounds in the RA-30? (It is labeled as GM/GS). I have only located a few addtional sounds, by switching banks on my software sequencer. And the manuals provided only list sounds accessible through the front panel buttons. Thanks in advance.