Salut Alain

oh, no keys appearing?
could you send a snapshot of what it looks like on your PC?
flipperdesign at gmail ... dot

this is hard to imagine as i'm forcing colors...but will check back what could cause that.

White noise, yes it could be. Maybe on another piano bar.
I've just added it for a quick test but it's not implemented with recording.
you can redownload from the same link

Thanks for the idea!