The right TACAN channel knob is inconsistent with user expectations and different from the left TACAN channel knob.
Most knobs work by using press+drag, so naturally one would use that for the TACAN channel knobs.
Current behavior:
Left knob: first digit changes
Right knob: X/Y band changes
As I could already change the X/Y band with a simple click, I see no reason to map press+drag differently on this knob.
The intended way to change digits seems to be the mouse-wheel, but that seems to be inconsistent with all other knobs on the plane.
Suggestion:
Left-knob or right-knob click+drag = change channel
Left-knob or right-knob mousewheel = change channel (for people that are already used to this, plus it works nicely)
Right-knob mouse-clicks = change X/Y band
