When starting a song a short high frequency beep can be heard

When starting a song the first time after boot, or after a couple of minutes after a song is ended a short high frequency beep can be heard. With consecutive songs I don't hear a beep.

I am using DAC2 Pro + DSP

Rpi 3B Rev 1.2

HifiBerryOS version: 20220228

Example: HifiBerry Dac2 Pro DSP 20220408.flac


Quick iPhone recording: first you hear the mouseclick than the song starts and you hear the high frequency beep.

Can anyone help me out?


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