Eytmotics are the OG and I’ve been using them for years. More recently Loop and the unfortunately -named Eargasms have had good reviews. They are all cheap enough that you can try them all to see which work for you.

Not the type of keyboard I was expecting.

It’s like somebody in China rolls dice and combines whatever functions come up.

Good recordings are good recordings.

Tapestry is a good call. Well-produced '70s soft rock with “hydraulic” drum recording was kind of made for such systems – can sound a little synthetic on a super-revealing setup, but smooth out nicely on a mid-range system. See also James Taylor, Little River Band (actually I think there are some MFSL discs of their stuff), Linda Ronstadt, America, etc. etc.

Try giving up on “imaging” and putting your speakers in corners or some other spot in the room, this can open up very interesting aspects of records.

The idea of a guy who has fronted a metal band (or whatever TF Korn is) for a quarter century can hear anything over the tinnitus is laughable to start with.