I have Cakewalk 8.04 using a Pent III 450mHZ CPU, 128MB Ram, 20GB hard drive and have experienced Cakewalk to slow down or speed up my audio tracks. When it happened I had one midi track and two audio tracks I tried all the changes in the Audio Options in Cakewalk but nothing helped. Finally I had to redo the audio parts to get it to work. I have no idea why it happened. I do run Scandisk and Defrag on my hard drive which is partitioned in 3 pieces.