First question - have you tried the card with some powered speakers to see if it's an issue specific to headphones?

A line out isn't usually powerful enough to drive headphones, but I can see from the photo that there is a 'TEA2025' chip on the board, which is an amplifier. There are two jumpers labelled JP2. It may be that these disable the on-board amp, hence the issues you are having. Try moving them to the alternate position and see what happens.

I'm not sure the Opti cards were ever that great to be honest. I've just put an 82C925 in my 386 - happy to have working sound, but it's very noisy - there's an audible click when the drivers load and the music on some games just sounds "off" for some reason.

I'll try plugging into my amp later, didn't have time this morning. The sound via headphones could go plenty loud enough, it just sounded like listening to hold music on a telephone.

Assume you have already found this page with the original manual and drivers: http://www.trust.com/en/product/09245-sound-e … luxe-wave-32-3d

There is a "3D" setting on the card, which could maybe be doing something weird to the sound?

You could also try turning WSS mode on/off in case it's that, but I am guessing here. Maybe someone else has some suggestions? If nothing changes it then perhaps the card is defective?

Well. this is embarrassing. Through my amp the card sounds fine, so I guess everything is good =D I've never seen a sound card that couldn't drive headphones without issue and didn't give it a second thought...guess this modern technology has spoiled me. Thanks all

Hi! 😀 I'm testing an OPTI 82C931 right now. Sound is clean, as far as I can tell.
I'm using jumper setting for Line-Out. Mixer is set to "MIX" and Line-In/Mic levels are zero.
Main Mixer is at 52%.

That looks like a decent card with onboard midi. Not often you see the Opti 82C941 chip for midi.

The only bad thing about the board is that it doesn't have real OPL3. The FM on the Opti chips is supposed to be really bad, but if you always use the onboard midi it isn't going to matter much except for games that don't support midi.