Detuning a bass from standard 'E, A, D, G' tuning to something lower
So when i refer to my tuning as 'Drop C standard', I mean C, F, Bb, Eb
Drop D is commonly D, A, D, G.
Drop D standard would be D, G, C, F
I assume that the Drop A that the OP is referring to would be A, E, A, D on a 4 string
Unless he means Drop A standard, which is A, D, G, C
There is of course millions of combinations of tunings, high, low etc etc
Nice
Si