This may be a stupid or obvious suggestion but if you are deleting stuff make sure everything in your trash gets emptied as sometimes I drag stuff there and forget about it which in the end doesn't really clear any space.

Again apologies if this was useless

The sound I could really use some help making is in the link below at around 53/54 seconds. Its the sort of waah noise that comes in on every other kick drum hit.

http://www.youtube.com/watch?v=RSlDKLgR2hY

Any help would be very much appreciated