Yes, man, YES, YES MAN. This is the issue, nearly word for word exact. Your experimentation has figured it out for me too. I can second OP.
I am however on 3.80. At band practice the other night I was going to show the crew some dive bombs as well as some feedback, and neither of them worked right. Turns out, it does indeed look like HX One takes the current Pitch effect On/Off status, and uses this value when you switch to Feedbacker. If you are on a Pitch Capo effect (like -1 semitone) and toggle the effect to Off, just regular standard tuning, and then navigate to Feedbacker, the effect will not activate when using the footswitch to turn the effect on. The light turns bright yellow but no effect.
If instead, you are on Pitch Capo, and the effect is ON, with the Pink light, and then you switch to Feedbacker, when you turn the effect on with the switch and the yellow light comes on, the effect now activates and works.
I was also able to show this behavior on the Poly Pitch (dive bomb and slide effect). Going from this effect being toggled off, and navigating to Feedbacker, the feedbacker effect will not activate. Going back to Poly pitch and triggering it ON, then navigating to Feedbacker, the feedbacker effect works as expected.
For now, I have had to set up the effect library ordering so that Feedbacker is at position 000 (the top), and then my Poly Pitch( slides and bombs) at 001, then -1 Semitone Poly Capo at 002, and -2 Semitone Poly Capo at 003, with both of these saved as ON. Default state for rehearsal is in Feedbacker til I need to turn it on. Scroll to Dive Bomb and I can turn that on or off at will. Next effect half step down, always ON, next full step down, always ON, so that if I go back to default state (feedbacker), that effect will work.
