Hello ! I've an issue with sound via ISO7640FM from XMOS to AK4493S dac. Both devices are supplied with different transformers with their own power supply ldo's, ground is disconnected and there are two independent LT3042 for dirty and clean sides of isolator. The problem is in distortions in sound, the sound seems to wheeze a little. Has anyone encountered setting up such a microcircuit and various kinds of problems with it?