Hiya all, So here's the problem... Whenever I record in high speed on my 644 I get slow fluctuating speed when I play back the recording. This doesn't occur when I record in low speed. I have tested this with both type I and type II tapes (90 min). I have also tested playing back the high speed recording on a different tape deck.. the same speed fluctuation occurs, which leads me to believe the problem occurs when the recording is captured, rather than during playback. Can anyone help me out here? I've searched google a dozen times, but can't seem to find anyone that has this problem. I think the strange thing about this issue is that recording at low speed works perfectly fine. Any suggestions/ideas would be greatly appreciated. Thanks!