Hi @Dig_Art,
- Tap is not actually used to change the song Tempo like with adjusting the Tempo Faders. It’s used to edit the analyzed BPM value. In most cases you probably don’t want to do this as djay is very good at automatically analyzing the correct BPM for songs.
- I checked the Built-in MIDI Mapping for the Mixon 8, and it appears that SHIFT+Headphone Cue is not mapped to BPM Tap. However, you can easily map this yourself if you like. Given that Tap doesn’t change the track Tempo like you were expecting, I suspect you won’t want to bother mapping this anyway.

