First post, by Eep386
...And it works 😀
I have a dead CT1740 and a healthy CT2910. I rather like the CT2910 a lot as its YMF289 OPL3 FM chip sounds exactly as I remember the FM synthesis on my first sound card, an Addonics YMF719E-based card, had sounded. But one thing that was off-putting was that notorious bugged v4.13 DSP with its clicks and stutters, so I've been sticking to a CT1770 SB16 SCSI up to this point.
Today I worked up the courage and swapped the DSP chip on my CT2910 with the v4.05 from the dead CT1740, and much to my surprise everything works fine (so far). I haven't tested specifically for the single-cycle DMA clicking problems and the like, but for now I am happy to have a YMF289 OPL3 SB16 with a 'non-bugged' DSP. Earlier on the CT2910 I had changed the MC3403 quad op-amps out for TL074's, and that had cut the hiss roughly in half. I also changed the op-amps on the CT1770, and got a similar (albeit somewhat less pronounced) improvement. The CT2910 already has a good CT1703-A DAC so that does not need to be changed.
Further testing (and pictures) is pending.
Life isn't long enough to re-enable every hidden option in every BIOS on every board... 🙁