T Pitch change (singing voice)

[Kylo]

This may seem like an odd question but maybe anyone who's a musician or singer here and was concerned with the way T affected their voice will know the answer.

I know all pitch drops are different and depends on how T affects the system as well as the preexisting character of your voice, but does anyone know the average range or drop in Hz one can expect in an FTM voice after T has done all of its work?

Anyone know of any official studies or investigations of the subject? Or just general observations from an FTM group?

[Abbiem]

I take estrogen and testosterone
both the female and male hormones, because i want both,

my vocals, have always been very much powerful from birth, no effects from hormones on my voice at all.

I tell you what improves the vocals, ANGER!