Not OP, but yes! I've had the exact same "symptoms" my entire life.

- A faint multi-tonal background "hiss", only apparent during silence, never goes away but is quite relaxing. I'm hesitant to even call it tinnitus - Visual snow. I have early memories from at least 5 or 6, staring at the blue sky and noticing it's not pure (I see blue as everyone else, but with a very transparent layer of static)

I have attributed it to something "off" in the sensory filtering part of my brain