Larry
Its much clearer now
I would presume the use of patches has more to do with changing sounds "Mid- Part" (by allocating/swapping patch numbers and or names at different times) than selecting one instrument patch for each channel which is what I do. I'll stick to allocating one Inst/Patch per channel for mixing's sake.
Anyway I understand the basic concept of the library is providing names against codes for the latest proprietary systems.
Thanks also for clearing up the Opcode Core Audio/Midi references for me.

The Korg Manual in my opinion is not user-friendly (or maybe it is for anyone with a high standard of Seq experience). I will have a look though at the settings. Maybe I'll get lucky and change the Sax and Trpt settings to produce a more realistic sound.
I'm stuck with this PT and Korg Seq system at present so changing to Motu's DP or using Soundiver is not an option right now. Its good to know what options are available though and I thank you (and thank you also Jody) for the information which I have printed out for reference.
Again, many thanks for your valuable time and advice
Tony

[ BTW; I will be in Hong Kong next month and hope to buy the PT6 system although the latest postings on the Digi DUC are less than complimentary about OS X and PT 6 recommending10.2.3 over 4 for stbility (at this stage). PT 6 is also preventing the Fan run-down in 'sleep mode' (at system level) which is annoying alot of people but I hardly use 'sleep' so it doesn't affect me. ]