Strange noises in real feedback

I have just bought muse 1 headband and start use Muse application on IOS. I hear strange noises(like helicopter or plane) with real feedback for all types of soundscape. Is it normal?

Hello, yes I’ve experienced the same with the Muse 2.
Like how you described, I think it is to do with the feedback on the headband picking up your brain signals.

I don’t think it is meant to be part of the soundscape at all but just the inner workings of the headband that creates this noise.