🚀 go-pugleaf

I am trying to record acoustic instrumental sound into Adobe Audition 1.5 using a line-in preamplified mic.

Problem: After a couple successful sound tests, the sound from about the third take on is corrupted. The wave form sits at silent until it picks up a loud note, the note cuts in (I lose the beginning of it), and then dies too quickly back to silent. It almost looks as if it's been nuked by an overactive noise reduction pass. It sounds like 'wa wa'.

I have tested all the hardware involved. The mic works with other devices, and the sound card on my computer is fine. I'm wondering if it might be an issue of memory buffer. I cranked up the buffer in the system settings, but that didn't make a difference. I currently have only 1.5 GB of free space on my computer. I am assuming that should be enough...

Does anybody have any ideas of what could be wrong? I have no idea what to try next.