There is a simple SMF volume control in the Makeup Tools Global section that can turn up or down and entire SMFs volume in one go, and write it to the SMF. Plus the Makeup Tools are where you can write in Mutes permanently (unless you use the Music minus One section, which is global) to your SMFs if you want just Bass and Drums.
It is probably best that you bring your SMFs down to match the styles (easier than the other way around, I'd think!) so you can go from one to the other without having to mess around with sliders too much...
You might also think about if you have the Mastering compressor ON, if the SMF is very loud, it may 'duck' the keyboard parts to relative inaudibility...
The main thing might be to write yourself a 'startup' UPG that sets everything the way you want it, then you probably don't need to re-boot just to get the RH Parts back... Just call up the UPG.
Hope this helps.
[This message has been edited by Diki (edited 07-22-2007).]
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An arranger is just a tool. What matters is what you build with it..!