Crackling when recording form new digital piano

Greetings!

I get spike like pops, when recording my digital piano Casio privia px 1000 trough the output jack and into a USB mixer line input.
What could be the cause? I just got the piano a couple of days ago and i learned this tune and i tested the recording. Excuse the crappy playing it was late at night.

I attached a sample of my garbage playing so you can hear the "spikes" or pops.

Thanks in advance!
 
Try lowering the volume.
CasioPX-S1000Manual-snip.gif