To record your voice, you have to have the input device set to something like microphone, and have to have a microphone plugged in and active and such. If you've changed the input device to stereo mix or wave out mix, it will only record the sound coming from the speakers. It's possible that you have something muted or the microphone volume is too low... but I wouldn't know how to check that.
Recording without replacing what's there is a problem I have, too. I think it can be done if you make sure that the recording isn't selected before you try to record again. (Use ctrl + G to change what's selected).
[edit] Oh, if you mean to record things on top of each other... the only way I know to do that would be to record them separately and mix them. If the timing is difficult, I'd suggest listening to the first with headphones while recording the second. I've done it with different instruments myself... but I'm not great at rhythm, so it's turned out somewhat messy.
看過來!
"If you want utopia but reality gives you Lovecraft, you don't give up, you carve your utopia out of the corpses of dead gods."
MaxAngor wrote:
George... Don't do that.