So Im in the track view , I have about 8 tracks looping for 8 bars , I notice if I take my curser over the clip It becomes an " I " with either a zero with a back slash or a tiny square box, Well that quickly mutes and un mutes the clip , I don't know if that was there before in X3 or before that, But I just found that and I love it... Thought I'ed share.