Reading this made me realize something : my inner voice actor is a female, like me, in French (my native language) and German (that I've started learning at a really young age even though I took a huge break), but it English it's not the same frequency, I'm pretty sure it's male (or Sarah Michelle Gellar's voice, as I learned a lot by watching Buffy). I had already noticed my actual voice drops lower when I'm speaking English, but somehow I had missed that. Nice!
Guys, try to make your inner voices whisper as quietly as possible. Now try to make your inner voices scream as loud as possible. Now what did you notice?
The volume of your inner voices stays the same even though you're thinking that they shouldn't be.
The volume of your inner voices stays the same even though you're thinking that they shouldn't be.