Hi, my main guitar is a hollowbody with a P90 in neck and a humbucker in bridge position. The guitar is significantly louder than my hollowbody with two filtertronic-style pickups due to their rather low output. I like the sound and need the guitar for certain songs of our set. Adjusting the volume on my amp when changing the guitar is no option: I regularly mike my amp and changing the volume setting will be difficult - not to mention the joy of turning knobs on a stage..... I thought about a small line mixer, but I'm playing wireless and don't want to use several units. Therefore I'm looking for a booster which does NOT alter the sound. So far most of the boosters I know and tried do influence the sound. Some of them are great in enhancing the sound, but that's not what I want - I just want to have a quick and reliable volume adjust. Any suggestions? Thanks in advance!