Input signal detected

I´ve noticed a small signal (about -55db) coming in to inputs mono or stereo on cubase 7.
Is that normal? I have all the interface volumes down and any instrument disconnected.
It records some minimal noise in the track. Iam using UR22 steinberg interface.

Are all VSTs (effects & instruments) disabled or removed from every track and channel?

Regards. :sunglasses:

Yes, even on an empty project. :frowning: