Has anyone else ever seen a mechanism on Double Bass that detunes the strings (a-la Hipshot for those of you with plank knowledge)? My teacher last semester had one on his that was custom made for him by a friend. I thought it was a totally rockin alternative to potentially stifled five strings and potentially difficult to play extensions. I realize when standard or even heavy gauge strings are detuned, the tone will also change somewhat, but I'd still like to here/see some other examples (I haven't heard that bass detuned or otherwise). It seems like a really good idea.