Strange sound behaviour on Equium A300D-16C

This isn't so much of a problem, just a bit of an annoyance at times really. The sound's working fine on my Equium A300D-16C (sound card and driver all fine on the Device Manager etc. etc., buttons working fine), but, the sound level (volume) keeps changing. I first noticed it as I'd installed the sounds add-on for MS Office 2007, but wasn't always getting sounds, but then other times I was getting very loud sounds, and others very quiet sounds.
I'm +fairly+ sure I'm not accidentally touching any shortcut keys (at least the lit up quick access ones above the keyboard I'm not, but are there any other shortcuts for sound?), but for instance last night at one point I noticed the volume was set at 16, but then half an hour or so later it was 4, and then this morning when I booted it up the volume level was at 0 (but not muted).
As I said, it's not particularly a problem, because if I need to I just adjust the volume to what I want it to, but it's just been puzzling me these last few days as to what might be causing it.

Ah! //Slaps head and goes to hide under a rock// :-D I guess that'd be the one on the front that obviously rests against my slightly rounded middle...? (I am in shape - round's a shape! ;-))
It never even occurred to me that there'd be a dial somewhere! Duh!
Thanks for clearing that up. :)
//crawls under rock//
Message was edited by: BlissC

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