Not bilingual, but my argentine roommate at the time could not recognize my voice when I spoke french (my native language). I think he thought my voice was lower and my accent flatter than when I spoke spanish.

You can also kinda lose your native accent if you live in another country, or even another region of your own country, for too long.

Apparently my German sounds like I’m french, my english sounds like I’m australian, and my French sounds like I’m a rural farmer.

I've been told by French girls I sound like I'm mocking stuck up Parisians when I speak French.

I'm pretty sure I change my pitch depending on which language I'm speaking. Scandinavian languages go pretty low, English and German is somewhere in the middle, and in French and Italian I go pretty high out of some desperate hope that it will make me easier to understand. I'm not sure it helps much.

Intonation of course changes, though probably not enough. And I'm pretty sure someone from a village close to home could recognize traces of my accent no matter which language I'm trying to speak.

What about you @Blaze@piefed.social

I've been bilingual from an early age and consider English to be my second native language. There's no difference in tone or intonation and I can slip from one language to the other in the middle of a sentence without missing a beat. But, for some reason, it's a lot easier for me to be social in English than my actual native language.