Ok so we’ve established the LP itself sounds good with the TT&box - yes there will always be some vinyl hiss, but normally only detectable at high listening levels.
Is the tone arm and cartridge set up properly for : tracking weight, anti-skate, vertical alignment of cartridge?
Is the TT set on a good firm solid surface isolating it from vibrations?
You don’t listen loud on speakers to monitor while recording do you? That can feed back to the TT and/or cartridge.
Ok time to try some new tools. Have a look at Brian Davies’ site: http://www.clickrepair.net/
I use his ClickRepar all the time, every LP transfer - excellent results.
I have used his NR stuff in the past on trial - but decided I didn’t need it long-term (as in my earlier post in this thread).
They both cost a bit - but the great thing is that Brian allows you a 14-day free trial to test the s/w to see if it works for you - I bought CR the following day after trialling it.
To use them capture in Audacity, export a 32-bit float WAV file, process through Brian’s s/w, import the repaired tracks back into Audacity for further processing (labelling,inter-track clean-up, normalization etc.)
Another forum elf here (BillW) IIRC uses ClickRepair in two passes: one for click removal and the other for de-crackle - you can do both in a single pass but he believes he gets better results with the double pass (I never use the de-crackle).
See this Sticky thread on ClickRepair: Click/pop removal - ClickRepair software
Yup, that sounded fine to me, listening on my studio Sennheiser cans.
WC