Hi,
I have the same experience as the OP... When I roll back the volume control on the guitar the treble gets lost. The Pod Go seem to behave differently than my other effects and amps in this regard. Today I tried to connect a buffered pedal (Boss CS-3) in front of the Pod Go, and even though the pedal was off the sound was quite different, a lot brighter, and the guitars volume knob behaved more like I would expect, with preserved treble.
The input impedance of the PG is supposed to be 1 MOhm, so one would not expect to need an additional buffer in front to preserve the treble.
Anyone else who have this issue?
/Mats