Yeah.... what they said.

Be sure that you have selected the proper input and the correct side of the input.....left or right.

IIRC even a mono input needs to be selected properly... in my case it's the left stereo input for mono.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.