High distorsion AD5222 with low code

Hello all,

I use a digital potentiometer AD 5222 in audio application, at code max 127 all is ok, but at low code around 20, sound is very bad with scratches....could you help me ?  this is shematic under. I use single supply with Vss=0 and Vdd=+5V , may be I should place it before C6 and C8 with idle state 2.5V DAC output ?

[edited by: Vin at 4:57 PM (GMT -4) on 26 May 2021]
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