Same problem. I've updated one PC and one Dell Notebook. Both with the problem only in the microphone. I had notice that if you enable the resource to hear your microphone (you listen yourself), LX-3000 works. But this is not an resolution.
So the most recent windows 10 update 1803 for alot of people messed up peoples webcams and microphones and prevented them from working in this video i show you how to fix that issue ►Affiliate With GreenManGaming Get Cheap Games Here: ...
I experienced the same problem after Windows 10 update. I am on a Lenovo workstation. Trying to use the Lifechat LX-3000 to record voiceover on Techsmith Snagit 18. Techsmith advised that I upgrade to Snagit 19, which I did, but the issue was not resolved. I was told that the driver needed to be updated but there is no driver available for this unit for Windows 10.
I happened upon this fix for myself purely by accident.
I decided to find out which programs were affected by this lack of audio. I have Camtasia 2018 and tried a screen recording and noticed that the audio was turned way down, so I adjusted it back up to 100%. I did a recording and everything was recording properly.
I went back to Snagit 19 and tried a screen capture recording and the audio was also miraculously fixed.
I also use this same headset for Dragon Naturally Speaking (version 13). When I used the Dragon program, the audio for the other programs (Camtasia and Snagit) reverted back to no audio. Again, I went back into Camtasia to readjust the audio input levels and it was fixed.
I am not a tech person so I don't know why it worked or even how it worked... but it is working. Not the most elegant fix but at least, the headset is working in a roundabout way.
It appears to have some conflict with other programs that uses the headset. I am not experiencing any issues with GChat or Skype (as yet).