I have installed Groove Agent 4 onto a windows 10 laptop, and selected the MIDI Input to YAMAHA DTX900-1 and the Audio Output to Output 1 to a Focus rite Scarlett. Both are working, i.e. I can see the MIDI activity LED next to the MIDI Input light up when I hit a pad but there is no Audio and no activity on the MIDI Input Indicator in the Kit Slot. I know the Audio is working because if I use the mouse and click on an instrument in the drum kit in edit mode I can hear it.
Should say I using it in standalone mode.