At last the CPO series is completed. Available from March 26th on:
https://www.prestomusic.com/classical/products/9845365--friedrich-gernsheim-string-quartets-vol-3
Aren't there 4, not 3, volumes, with no.4, quartet no.2 and the string trio, recorded but not yet released, according to a thread on this site last year? (The Diogenes Quartet announced this on their website, I believe, and it makes sense since just because there is an older recording of quartet 2 doesn't mean cpo's going to forgo including it anymore than in any similar case...)
I forgot about those works. No. 2 had been recorded on Audite which I also had forgot. Oh, well, more patience needed then.
This has been released today
Yep, here's the JPC page (https://www.jpc.de/jpcng/cpo/detail/-/art/friedrich-gernsheim-streichquartett-nr-4-e-moll-op-66/hnum/12228005) for it. String quartet no.4 in E minor (Op.66, 1899) and string quintet no.1 in D op.9 (premiered 1867).