I have a session of audio tracks, volume is jumping up to max at random points in the track, happening on several tracks, putting a new node in brings it back to where it should be, but happens randomly further along the track. Tried deleting all automation from the track, problem re-occurs. Any ideas? Doesn't happen with automation turned off, keeps steady volume. Doesn't seem to affect any other automation - have reverb and eq automation, all seems to work fine, except volume.