No audio passthrough with the roku streaming stick 4k, i'v attached to my system a silicondust hdhomerun atsc 3.0 tuner and i've added the hdhomerun to the stick as stated "no audio passthrough" please fix this issue.
The SS4K/4K+ (3820/3821) ONLY supports passthrough (aside from decoding AAC to PCM) of Dolby audio, so that doesnt need to be "fixed".
However, Silicon Dust codes the HDHomeRun app (and otherwise controls the HDHR ecosystem from server to tuner to client), so all issues with the HDHR app need to be addressed to them:
https://forum.silicondust.com/forum/viewforum.php?f=133
https://forum.silicondust.com/forum/viewforum.php?f=113
As it happens, SD is planning a series of updates for the HDHR app for Roku, so you need to follow their progress.
If you want the best experience with the HDHR ATSC 3.0 tuner etc especially in terms of 5.1 audio, you need to get the Ultra (4800/4802) as it is the only Roku model with AC4 decoding support.
Otherwise, server-based transcoding/conversion to AC3 (from AC4) is required - try toggling that setting and see if you get a different result.