I have soldered 2 fat ground wires on the delfina (the digital part of the card) and I can confirm that it works way more stable. The high pitched sound is very faint in the background but clearly noticeable.
I am waiting for almost 2 months for my clockport expander, so I cannot test it, but AFSIK port 0 on the expander is a 1 on 1 connection with the original clockport.
I use aux1 for the native paula input so the analogue ground is connected true there.
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