Hello all,

Long-time lurker, but recently gotten back into vintage hardware, in fact I had completely forgotten that I had registered here a few years back before life got in the way of this little hobby...

Anyway, I have a strange little problem that I can't quite work out if anyone is up for a wee challenge. I have a CT1330 SB Pro 1 that is exhibiting some strange behaviour. Both OPL2 chips seem to be working fine but the digitised effects/speech aren't working...sort of...
So in either my 386 or my P1 the card behaves the same, cache enabled, cache disabled, other peripherals disabled etc.
The card isn't detected at all in the P1 when running the creative installation and is intermittently detected in the 386 during installation. I can get it to be detected by some games though (although that may just be reading autoexec).

So none of this strikes me as odd yet, the DSP is probably not working correctly as when I run something like Wolfenstein 3D the adlib parts play fine but the effects don't sound right at all. BUT when I play Duke Nukem 3D, everything works perfectly as it should, FM and digitised effects, all come out perfect both in setup and in game which is the part I don't get. This is 100% reproducible, it always works without fail.

I've not got a problem with other ISA cards, SB or otherwise, in either computer.

I've tried changing around the card settings too but it doesn't seem to make a difference. All the traces, caps, chips etc. all look to be in good order and all the jumpers are in the correct places.
Surely if the card wasn't working properly I wouldn't get any effects/speech in Duke at all?

It's not a huge problem as I'm only using the card for the Dual OPL2 FM anyway as I have other OPL2/3 cards for everything else that needs it but it just seems strange.

Any ideas? Is the card sort of dead and just playing up or am I missing something really obvious?