The log shows that you are playing a movie with a DTS audio track and have DTS passtrhough enabled. So Kodi is transmitting the DTS stream as it is and the volume setting in kodi doesn't have any effect - this is what passthrough is meant to do so everything seems to be working as expected.
If you want multichannel audio output with volume control you have to use HDMI audio output and disable passthrough. Then kodi will decode the AC3/DTS streams, apply the volume setting and transmit multichannel PCM audio over HDMI.
so long,
Hias