Soundcard oscilloscope, one channel rolling

[hadoque]

Hi
I've just built a sound card oscilloscope adapter, using this article.
The first channel on the oscilloscope works great, I tried it using a sine wave oscillator I made a while ago. The problem is the second channel. The waves are the same as on the first channel, but the waves are rolling sideways. I also tried a square wave oscillator with the same result, so I really think the problem is in the adapter.
Anyways, I don't really have a clue on how to troubleshoot this. Does anyone have any idea on what might be causing this?
Perhaps this is something you usually calibrate in the software?
I really don't know a lot on how to use oscilloscopes, which is kind of why I did this project.

 

[Nigel Goodwin]

Presumably you have to switch the sync from CH1 to CH2?, but as you have to pay to view the article you mentioned, I can't tell if it's done in hardware or software (or even if you only get sync on one channel).

 

[hadoque]

Ok
The sync is defenately in the software. I'll look into that. Thanks for the help.
Edit:
I found it. Now everything works fine. Thanks