taking out spare voice from sound file

[adobe audition , goldwave]

I Have wav, mp3 file which contain original track and my voice at the foreground, my voice sound thicker, I tried to reduce or clear it via the softwares:

adobe audition , goldwave and wavepad but didn't succeeded

The original record was made out of analog mini tape and the problem occurred while trying to record from analog tape to digital one via wrong cable that made my voice be added at the foreground

The damage doesn't seem so bad so it can be removed
I add few pictures of spectral analysis ; I have  knowledge on signal processing






please help

You can't tell anything from a picture - what we need is a portion of the file itself (preferably a section of the .wav file, not the MP3).

That said, don't put too much faith in processing as this sort of thing is notoriously difficult, although it is possible that some improvement could be made.

Does the source tape and equipment still exist?  A new transfer is the way to go.