I found my own answer to part of my query - I had been trying to change Volumes for the Style PArts, then saving the style, which didn't work.

What I found is that you simply have to save these changes as part of each OTS (up to 4) that are part of the style. Worked perfectly! I didn't need to go to the Style Creator.

However, saving the "ON/OFF" Channel status does not work this way, so maybe that must be done in Style Creator.

SO - my conclusion for now - which will suit my needs - is to change any volumes for Style Parts, including perhaps setting some to zero (to silence them), then save this into any OTS settings that I have for that style. And of course, SAVE the style. Then when I recall (call up) that saved Style, and use the OTS, the volume levels for all Style Parts will be whatever I set them to.

Thanks for the responses / answers that people have entered in response to my query ...

Jim