As far as I am aware, the Hegel HD30 is able to be used on Linux at rates up to PCM 192kHz without issue. It has been noted that the HD30 was not capable of playing DSD while connected via USB to Linux, Hegel has a custom implementation that requires drivers on MacOS and Windows. I can schedule some testing during the week to see if there are any interactions between the Innuos and Hegel USB implementation specifically. Here is a post with some further information on the issue of Hegel and Linux.