I have always used my basic PCI sound card to record via Line IN with no problems..... till recently. I have two issues;

1) It not longer wants to record properly stereo, I only get the left channel like so....


2) I tried to record Mic'ing an amp for the first time. I did not expect good quality, but I get a strange and annoying phasing/ chorus-type issue which you can hear in this sample; http://k003.kiwi6.com/hotlink/565ubwr7e0/amp_recording_issue.mp3

So my question is WHY for both these issues? Why is only the left channel being recorded, and why am I getting a weird phasing sound when recording my amp mic'd?

And is it possible to fix them without upgrading or getting a new sound card?