I connect an external controller, but I get no sound out of the FGDP-50.

The pads work normally. I verify, for example, that the kick is on channel 10, note 36. MIDI Monitor verifies that my controller sends this channel and note and also verifies that the FGDP is MIDI thru-ing the same channel and note. I verify that the trigger setting MIDIRcvPad is On for every pad. I even tried toggling Local Control in the Utility menu. Still, I get no audio out of the FGDP via the external controller, only its local pads. Any suggestions?