alright i know standard, drop d, d standard, drop c.... but i dont know anything lower then that. i just tuned my guitar so strings 1-5 are tuned 4 semitones flat the the 6th one is 6 semitones flat. what is that tuning called? what about 1-5 tuned 3 semi tones flat and the 6th one 5 semitones flat?
The second is Drop B I think. The first then must be Drop Bb.