noise when recording using Magix or dexster

  widdy 14:35 18 Nov 06

I am attempting to transfer old cassettes and LPs using Dexster and Magix Cleaning studio. However, there seems to be an inherent noise like Motorboating during silent periods, it is a regular pulse at about -30db. very annoying but not coming from source and is same on both programs, I have tried recording with speakers disconnected, Line In disconnected and microphone disconnected, all reduce the level a bit but none seem to be the cause.
Any suggestions at all folks

  widdy 14:37 18 Nov 06

forgot to mention, noise seems to coincide with movement across the screen of sound being recorded

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