Hello everyone, It’s “nice” to see this is not just an issue with my FP6. This concert video perfectly demonstrates the experience I had yesterday on a concert. I was front row and all sounds basically completely vanished in an extremely loud distortion. A friend of mine just normally recorded the same scene with a cheap Xiaomi and it came out fine. The microphone quality is freakishly bad with this phone (other than that, I really love my FP!)
It also is weird the audio is only on the left channel.
I can now add that I can record (with Blackmagic) through a relatively cheap Lavalier type external bluetooth microphone (from Amazon: Neewer KM23B) alright. But I cannot record using Fairphones Fairbuds (the small ones). The level would be okay, there are no clippings. But HEAVY artifacts from severe postprocessing. Obviously Fairbuds are ONLY for voice, and nothing but voice. Recording normal audio (music) is possible, but the results are useless. So there is postprocessing on Bluetooth, but it seems limited to Fairbuds and not to all BT microphones.