Your wish(es) will be granted with ZO2.3!
When the volume control to accommodate for line-out was added, along with the last minute component changes before production, some unforeseen side effects resulted. But, adding the high gain mode has definitely had a positive effect on the overall design... both in respect to the volume levels, as well as the sound signature.
This evening I did some critical listening with the latest rev, and although this is purely a subjective opinion, I felt as though it had a much tighter and harder hitting bass response than any of the previous ZOs (including ZO1), as well as an improved level of clarity. In fact, I personally feel as though it has some of the same characteristics as the SmartVektor FullSpec technology!