Never understood why they saw the need for quick and easy access to headphone volume…
To be fair, main volume is always accesible with Function + Level.
Headphone volume is also the only potentiometer on OT, so quickly and reliably adjusting a parameter in all conditions is reserved for hp volume.
Maybe it’s because many folks will use OT as their mixer/fx unit/loop player/sampler-looper-thingie what doesn’t need quick volume cuts, fade ins and fade outs?