UR 12 Sound bleed

Hi There. I just got this today and was recording something and I am getting bleeding through it.

I am using Audicity.
I imported a song from MP3.
I layed down the bass track and drums.
But I can hear the song I imported even though I muted that channel. Is there a way to keep that from bleeding in?

I just do not know how to install the UR 12 with Audacity.

With the UR 12 you have got a full version of Cubase AI 8.

You just have to download, install and register this fine piece of software.

The bleeding you hear is your mic picking up volume from your headphones. Try a noise gate

Or turn down the volume of your headphones.