Basset Horn not playing back with NotePerformer

Hello, I’ve created a Basset Horn stave, but the instrument doesn’t play back. I applied the NotePerformer playback template. On the Play tab, under the Track Inspector the device is 04 - NotePerformer, port 1, channel 12, and it’s using the NotePerformer expression map. When I click the e button to open the NP mixer, the Bassett-Horn sound is set on channel 12, and when I play back the score I see the NP mixer levels light up, but there’s no sound, even if I solo the Basset Horn stave. All the other non-basset horn staves appear to play back properly.

Does anyone else know what I need to do to get this Basset Horn stave to play back? I’m still somewhat new to Dorico.