Windows XP sound settings (help for a numpty!)

[Tyre Smoke]

For some reason, and it's probably something I've clicked on in error, I'm getting an echo on everything. I've tried resetting windows default settings, but it's still happening. How can I stop it?

It's a 'factory fitted' Realtek AC97 audio device if that helps.

Thanks in advance for the help!

[Tyre Smoke]

What blue square with yellow circular thingy?

[Tyre Smoke]

Thanks mate - all sorted now!