Thanks for the reply, probably a poor description on my part, what I'm getting is a distortion on the groove clips that sounds similar to a speaker being overloaded. reducing the track or main faders has no effect.
I'm still using my Focusrite interface, but when using groove clips or loops I usually drag and drop them into the track pane.
As I say before the crash, using this method I never had a problem, so I'm just wondering whether I've just got something set wrong, but not quite sure what.