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February 4, 2021 at 6:15 pm
#157070
page 36 tells how you set the MIDI mappings for H9. You just assign a MIDI CC value to Tap Tempo and that's it. This can also be done more easily in H9 Control.
https://s3.amazonaws.com/com.eventide.downloads/Product+Manuals/H9-UserGuide.pdf
That's all I can help. You need to ask Boss about how you generate a MIDI CC from you external switch via ES-5, but I'm pretty sure this is doable.