Auditioning Sounds in Drum Maps

Hi all, quick question about drum maps. I’m setting up a map for a custom sampled drum instrument in Kontakt. Everything basically works, except I noticed one weird quirk I’m trying to understand. When I want to audition drum sounds by clicking the blank square at the left of the Setup window, I only get audio when the Kontakt midi channel (that is, the “midi in” setting just under Output on the front plate of the Kontakt instrument) is set to “Omni.” If that channel is set specifically to Channel 1, I get no sound when I audition (though Kontakt’s activity indicator does indicate it’s receiving a signal).

This is weird to me because the drum map itself functions just fine whether Kontakt is set to Ch. 1 or Omni. I can enter notes and playback and hear it all. So where is the signal going when auditioning that it gets lost unless Kontakt is listening on all channels?

In case it’s relevant, my drum map is set up so that Channel is set to “Any” for all sounds and Output is set to “Track.” I’ve tried changing these settings around though and the behavior doesn’t change.