Webcam audio has gone since High Sierra

Since upgrading to high Sierra (version 10.13.1 (17B48) on my Mac Mini (Late 2012) I have lost audio on my Creative Web Cam both in the settings menu when selecting the device - no sound appears to display in test bars and also in general on face time only video shows with no audio.

I have tried disabling SIP and re-enabling as read somewhere this caused issues in the past, but no joy.

Has anyone had this issue, and potentially found a fix?