How to set gain?

Hi All,

Quick question: how do I set the gain on my sound system? I'm using mpg123 to play mp3's (in remote mode) and want to be able to vary the volume. I think I see how to do it in the opl3sa2 driver code, but I would prefer an easier and more generic way (so that it will work with any sound card).

I looked for a generic oss.c, oss.h, mixer.c, mixer.h file in the sound drivers directory of the kernel (2.4.4) but didn't see anything other than specific drivers for specific cards. I'm looking for the cleanest most generic way that makes sense...

A pointer would be very helpful, a code snippet would be a gift from the gods!

Thanks in advance,

David
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