The mute function does not mute the Stream's audio inputs. Both the mute button on the jam session toolbar and the mute button on the Stream only mute the Stream's built-in mic. To mute your inputs, turn down your audio source, such as turning down the volume knob on a guitar, or turn down your faders in the session mixer. You can also turn down the Stream's input gain knobs for each channel you want to mute.