Hi pj and Derek
yes, there is a nice generic framework built in the XG architecture, known as assignable controller. Every DSP has one dedicated parameter, that can be controlled by this assignable controller. But Yamaha has forgotten to make this assignable controller accessible in the Genos software.
There is no direct way, to assign for example a foot pedal or a slider or knob to the assignable controller. If this was possible, it would be wonderful for the control of most DSP programs. Instead they built a special solution only for Wah pedal, and in this special solution, they have forgotten the multi FX program.
Derek, you are right. It is possible to link for example mod wheel CC1 with the assignable controller, and thereafter, you could control DSP parameter using the mod wheel. However, this has to be done by sending a special XG sysex command. I have tried this from an external computer by sending this Sysex command to the Genos. And it kind of worked. But this link cannot be saved to any storage in the Genos.
I think that this assignable controller can be used in midi files, when they are XG conform and contain the corresponding XG sysex commands. But there ist no simple way, to make use of it for live play.
Uli