First question: Highly debatable, not entirely crazy but don't expect any kind of clarity to your notes and most bandmates wouldn't appreciate it.
Second question: I have not gone that low but I have played a bass tuned to F#, let's just say it was less than satisfying for me. It was on a fanned fret Dingwall and the F# string had so many wolftones by the second fret it was unplayable in my opinion.
And yes Jensby, nobody debates hearing E0, they debate over C#0 coming in around 13hz, which is the same frequency animals detect earthquakes and such on. It is highly debated that people can distinguish pitch at that point, I am not saying one way or the other, it is just highly debated.
Carvin LB76 / Dingwall ABZ ! Support Local !
MarkBass SD 800
Epifani UL2-310 / fEARful 1212/6
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