1) Oh my! Julia-Madrid such a refined enunciation :O
You sound like you could (with a *slight* accent adjustment) be a proper English lady. So many people come out sounding like Americans, I love it. You make me feel like a common oik

2) Obviously Kate you do not sound female in either of those recordings. Nice luck on the lack of voicebox though wish I was that lucky. I look like I am halfway through swallowing an ostrich egg. Anyway clearly your pitch is not high enough, nor is your resonance and thus your tone of voice sounding correct. For me pitch was easy, the real challenge was resonance. I say "was" tentatively since my voice is still very much a WIP and I have only just got it to a point where I think it sounds acceptable.
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Anyway since you asked, this is what I did, over a very long period of time, on and off for about 3 years or longer even maybe (first thing I worked on).
1) Get really anxious and embarrassed about practicing, plus, over the fear of trying in case I failed. All i could really do was sing along with stuff in the car when I was driving. Obviously female musicians. So that was pretty much all I did for a few months. I would occasionally try practicing easy phrases or counting in a high pitch. I didn't even know about resonance at this point. This lasted a long time since I was too scared and embarrassed to even practice properly.
2) I had to go all femmed up for an appointment at the UK GIC (don't ask) so I was worried and wanted to be able to speak, so I practiced non stop for 4 months. I tried loads of stuff. It was like banging my head against a wall. Nothing worked. I tried candifla, I tried that deepstealth stuff, pretty much if it was on youtube or well known at all I got it checked it out and discarded it.
3) After about 4 months I got pissed off. I had been to the appointment and I just didn't speak to anyone except the doc, easy. I quit for a while.
4) I started up again after only dabbling very occasionally at the beginning of the year since I got on hormones and I was gonna need to get this stuff down. I learned more stuff about resonance from some topics on another forum. Learned about keeping up the larynx better and some good exercises on how to do it, like apparantly I have muscles and stuff under my chin between chin and your neck. I finally figured out how to tense them all and stuff to get some control. I still sounded terrible but I kept practicing for a few months and actually made some progress. I did eventually get pissed off again and quit, however I kept doing exercises to pull up the larynx and other such things.
5) I practiced on and off very sporadically between then and about a month ago then I started practicing again and it is like I actually made progress without trying. I honestly think it is all about the muscle control, building and development of that. Maybe HRT matters to some degree too, plus I did give up smoking 3 months ago though I never smoked much anyway. Oh and also, if you are having trouble like I did/am, a whole lot of determination.
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Anyway here is my current male voice (100% usage IRL so it is not warped or anything from speaking en femme):
https://soundcloud.com/olivia1988-1/startedfromthebottom/s-DG8mH - Average 105hz
Here is probably my best recording so far:
https://soundcloud.com/olivia1988-1/quitegoodnow/s-ecRiu - Average 250hz
I have been told by people on the does my voice pass thread that I sound OK so I guess I am now willing to believe it.
Anyway I hope this convolution was of some use. Really though like I said all about muscle control, at least as far as I can tell anyway.