Dirt doesn't usually cause white noise--just intermitent operation. You may want to run a complete system check and see what shows up. This is done by:

1. Power off
2. press C2# - F2 - G2# (all three together) and while keeping them depressed,
3. switch the power on.
You'll see the word "TEST" on the display

With Tempo - / + you can go to the test you want to perform. Start/Stop will start the test. Wait till a test is done!

Hope this helps diagnose the problem,

Gary

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Travlin' Easy