Apple Logic Pro /LogicExpress Discussion

I have done many transcriptions of jazz artists and have tried using 
the Time and Pitch machine to slow the track down so I can hear each 
note.  I set the Time Machine on half of the original tempo and 
press "process and paste." I tried setting the Algorithm on monophonic 
but didn't hear any difference.

However, I don't seem to be able to do it without having a loud 
swishing sound in the background and a lot of distortion which make is 
often impossible to hear each note.

Any suggestions?

Thanks,


Tim