I found this post… https://forum.hearingtracker.com/t/cable-pinouts-for-hearing-aid-programming/35498. Unfortunately the pictures don’t render.
Thanks for replies. So I need a CS44 cable, NOT at CS44a cable. Good catch.
The Hearing Club still lists Flex Strips for sale ($20 for a pair), but I’ve not found any info on compatibility for Oticon OPN. Any clues?