keith.
this might work..run a test.
1. connect stereo headphone output from cass dek to ua1g line input.
(MAKE SURE YOU RECORD SOME CASSETTE NOISE BY ITSELF
FOR EXAMPLE BEFORE THE SONG STARTS.)
2. record each song in rb.
3. after recording go to town cleaning up the song as follows.
a. try the rb dx plug in NOISE GATE.
(read my tips re setting threshold...THIS IS CRITICAL.
setting the right threshold.)
and/or..
b. in RB youll also find dx plug in VINYL TOOL.
try some tests //experimentation.
and/or..
c. in goldwave is a noise reduction facility if i remember.
and/or..
d. if i remember there is a free trial of izotope available with various
restoration facilities.

i tell ya what ..as a favor to you mate.
do one song into RB , save as a wave a minutes worth of the song..
WITH CASSETTE NOISE before the song starts..or at song end.
and i'll have a bash at cleaning it up..send it back to ya..
and if your happy..i'll tell ya what i did.
then you can take it from there on all 40 songs.
i love to do audio restoration for the challenge of it.
also i lost my dad years back , and i know well the feelings in ones heart.
fair ??
god bless.

retired puter engr....powertracks on amd......NICE !
"what is the black art of audio engineering ?"
my silly songs...motagator.com/bmanning
see my tips in the tips section.