Hi,
I replied earlier as I had exactly this issue but it is now working perfectly. All I did was allow the recording device through the firewall. Someone replied saying how my solution couldn't work as it has nothing to do with the firewall - I know absolutely nothing about the firewall but I would be the first to agree because I can't see how it would make a difference but all I do know is that I changed these settings and the issue I had for months was sorted.
Maybe it was just a fluke but I hope it helps someone else. Here is the info I wrote in a blog post before;
I was having problems recording in Windows 8 using my Adobe audition and my USB mic. I thought my microphone had given up the ghost as no matter how much I changed the audio settings (including level settings in ‘Recording Devices’ in the bottom right hand corner of the computer) the audio levels were just far too low.
I did a bit of online research and saw that lots of people using USB mics and Windows 8 said the two were not compatible and that they were resorting back to older Windows 7 computers to get around the problem.
I tested out the mic on a separate windows 7 computer and realised that there were no recording problems there.
As a last ditch attempt I typed ‘Firewall’ into the search (even though I know nothing about firewalls) and it popped up with ‘Allow an App Through Windows Firewall’ so I clicked on that and lo and behold – Adobe Audition was not being allowed through the firewall. I added it to the exceptions list and then went down to the sound icon on the bottom right of the screen and right clicked and clicked on 'recording devices' Double click on the 'microphone', click on 'levels' and upped it from 0 to 75 and my issue was sorted.
p.s. I had tried adjusting the recording level on the sound icon on bottom right of screen lots of times before but it made no difference. I also had a sound engineer and a person that has used Adobe for years look at it but we couldn't get it to work.