Here's how to correct the input gain:
- Select your Control:III as the source on your radio.
- Within the first 5 seconds of selecting the Control:III, press DISC 3 on your radio.
- Press TRACK UP / TRACK DOWN (Left and right arrows: < >) to adjust the volume level.
- Select FM as your source, then go back to the Control:III and test your music. Repeat steps 1-3 until you've found the right setting and the "crackling" noise is no longer present.