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Lately I've been sequencing four timbres independently/simultaneously within a patch on my Radias. But now I want to change one of the four timbres via the sequencer and leave the others unaffected.

Is there a MIDI CC (I checked the manual, didn't see it) that I can send to the Radias to change a single timbre, or will I have to duplicate the entire patch into another slot, change the one timbre, and then use the sequencer to change from one patch to the other?

Hi,

Yep, there is ... something. Refer to p147 of the manual, switching timbres, in the MIDI chapter.
Roughly outlined it works like this:
* start with a program with 4 timbres, each having their own midi channel number set up
* send then a combination of bank select MSB (CC#00), bank select LSB (CC#32) and a program change message

-> the used MIDI channel number for the 3 messages indicates the timbre that will be swapped out
-> bank select and program change message select the timbre (1 -> 4) of a certain program that will be swapped in in the selected timbre.

So, it is not a single CC message, but in fact 3 messages. Don't expect it to be seemless from sound perspective.

Have fun!

Thanks Opamp, I knew you'd be the one to respond.