What "other sound" are you attempting to record? If it's audio from a file, try this...
Under the OPTIONS | RECORD tab. In lieu of Default Sound In, test the Streaming choice as well.
Then click the Open Sound Recording Settings link... 
When this page appears right-click on Stereo Mix and enable it... 
Now it should be recording what you hear when a file plays in Windows.
If the level is too low on playback, click the Levels tab, then the Normalize button on the toolbar and choose Auto-normalize.