I have just downloaded the 64-bit portable edition of XG Manager version 1.6.1 and extracted it to a brand new folder (i.e. no configuration files left over from
the previous version).
I set up the MIDI devices as:
Input devices: Steinberg UR22C-1 (I have nothing connected to this device's MIDI ports) - unticked
USB MIDI Interface - from my keyboard (shows a green light when data is received) - ticked
Thru output device - USB MIDI Interface - to my Yamaha MU10 XG tone generator (flashes a yellow light when data is transmitted)
Output devices: USB MIDI Interface - ticked
Steinberg UR22C-1, Microsoft MIDI Mapper, Microsoft GS Wavetable Synth - all unticked
Thru input device - none
XG synth: USB MIDI Interface
I created a setup with the XG voice Church Organ 2 in part 1, channel 1 and saved it as "Church Organ 2.stp".
I played the keyboard and no note sounded, so I checked View MIDI Input and Output Meters. Both showed the monitored device as being USB MIDI Interface.
The input meters showed data on Channel 1 when keys were pressed and released, and on Other continuously (probably Active Sense).
The output meters showed no data at all.
After shutting down XG Manager, I looked at "Church Organ 2.stp". Here are the relevant lines:
MidiThruDevices=19:0/Steinberg UR22C-120:0/USB MIDI Interface
MidiInEnabledDevices=20:0/USB MIDI Interface
MidiOutEnabledDevices=20:0/USB MIDI Interface
XGMidiOutDevice=0/USB MIDI Interface