OK, thanks, I think I get it.
My G70's mixer has an overall reverb depth parameter, too, but it is keyboard parts only. To change the reverb depth on style and SMF parts, that's another page altogether because there is a completely different reverb and effects section for them....
Just wish there was 'One ring to rule them all.....'
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An arranger is just a tool. What matters is what you build with it..!