Yeah, I had it tuned C# F# B E A D G B E. The F# alone was about as low as seemed reasonable through a tube amp, because the lower frequencies weren't overdriving the amps I played the same way the upper strings were, with good reason... they weren't meant to be able to reproduce those notes. When played through a PODxt Pro into a tube poweramp, however, that low C# was more than nasty, but I had to add my 1x15 cab for any clarity... definitely in the realm of the brown note
. I never found a good use for notes that low though.