Got the GL1 and shot today... only audio settings are for 12/16 bit and , as mentioned, for the mic/line in there is "attenuator". It would seem to cut the input by about 40% with posssibly some coloring, tho I can't tell what. I don't think you can turn the auto gain control off. It is reputed to be pretty good, but since I am using thsi as a backup (images only) camera, I didnt spend much time on that.(posted 8953 days ago)One other note of possible interest- the Frame Movie mode seems to be noticably more steppy than the XL1.
Rod P