Take a look at Rogue Amoeba's
Audio Hijack. It can handle virtually any audio signal from any source and has been a Mac standard for generations.
Their motto is "If you can hear it, you can record it" which might preclude me. …….. I've sent them an inquiry.
Well, colour me embarassed. They suggested trying their demo download and, lo and behold, it accepted the CODEC signal from the turntable. Maybe their motto should be "If you can hear it
or see it, you can record itâ€
I am not certain, either from the trial or from scanning their manual, whether I’d be able to insert markers at the start of every cut so that I could select specific cuts in playback. I’ve sent a query and will advise when I hear.