Panasonic RR-830 Desktop Cassette Transcriber / Recorder "static noise voices" Questions

...noise & static? How can I clean up a recording that is full of static? You can barely hear the voices in the background, if at all. This is a very important file! Help!! :) I Don't know of any ...

...noise. It doesn't matter if I am using the built in mics, or 1/4 jack. I have tried auto gain and custom gain. I turned it down where I could barely hear the guitar, but still got the clicks. A bit ...

static noise. It is strange because I have several tapes that worked just fine. Is there anything else I can try? The tapes may have been recorded at 1/2 speed or 1/4 speed so they are not playable on