I was successfully using Audacity to record from vinyl via a Terratec Phone Preamp under Precise Pangolin.
After upgrading to Trusty Tahr, not only was the sound signal massively reduced but it was overlaid with loud "digital" clicks, i.e nothing like record noise.
I couldn't figure out what would have changed apart from the operating system or its defaults.
I have since found that
- You need to use the system volume control to get the loudest sound below "clipping" (distortion) level and
- If you are getting the unbearable noise that I was, you must disable "software playthrough".
I don't know why this wasn't a problem before, but at least I can get stuff digitised again.