I just ordered a GL1 today (backup for my XL) and here is what I was able to find out:(posted 8962 days ago)1) Suposedly the Beachtek unit is a good workaround but I don't think it's released yet
2) The audio gain is settable via menu controls (oh, crap!) in increments- like 4 or 5 steps. Good enough for basic or backup applications, but probably frustrating for mainline work.
I suppose a Beachtek-type unit could be adapted by someone who knew how.
Good luck-
Rod Pyle