I don't have a B1 Four to test, but the following patches on a B1on appear to behave the same:
- Bypass (no effects)
- Ba Squeak (Rat) with Bal set to 0% (i.e. fully dry)
- Ba Squeak (Rat) with Bal set to 100% (i.e. fully wet), but bypassed
So that suggests that it's functioning as a clean blend.
It does look like there's a slight reduction in output below ~50Hz and above ~3kHz, but that's present on all three patches - so it could be a characteristic of the Zoom as a whole. Maybe that's what Al is hearing? I don't know how noticeable it is without a separate clean signal parallel to the whole unit for comparison. If anyone fancies doing a blind test, I could do some sample clips. I'm on furlough, so I've got time for such nerdery! 🤓