Are you playing an S900, too, Hammer?

I've got a nasty feeling that the 'sum to mono' problem that so many describe for the S900 (but no-one seems willing to quantify) may not be as big a problem for other arrangers. Kingfrog reports the T3 sums to mono internally acceptably, my G70 does, no-one has reported this on the Ketron's or Korg's...

Yamaha may simply have cut corners here, I don't know (but I SURE wish some S900 owner cared enough about the issue to test it properly)...