I have a similar situation to the one just described by gnackwatschn. 
One of my players is a squeezelite instance running on a Raspian/RPi4
device through a hifiberry digi+ card to an old Denon receiver.  I had
previously used the IRBlaster plugin (with an SB3 classic and an IR
transmitter) to control the receiver remotely (power on/power off/volume
up/volume down/audio in), but I have recently switched over to a serial
controller device with an ethernet connection that is plugged in to the
RS232 port on the receiver.

I initially tried using the Denon AVP/AVR Control LMS plugin mentioned
by gnackwatschn, but that had problems controlling volume even through
the default skin on LMS.  I switched over to Peter Watkin's DenonSerial
plugin to control my receiver, and that works great through the default
skin.

My problems arise using the material skin when the volume of the player
is changed.  As gnackwatschn mentioned, the audio setting for the player
needs to be at 100% in order for the volume to be controlled by the
receiver.  This works fine with the default skin, where clicking the
button on either side of the volume slider (see picture below) causes a
stepwise change in volume, and clicking within the slider causes the
volume to jump to the specified volume.  This works similarly with the
iPeng and Squeeze Ctrl apps (in the case of Squeeze Ctrl after setting a
preference to send volume signals even though the player is set to
100%).  

32878

With the material skin, the slider shows up as "fixed volume", but the
buttons on either side are indeed active (see picture below). 
Unfortunately, when I click the left button, the volume jumps to a fixed
high level, and when I click the right button, the volume jumps to a
fixed higher level.  Further clicking those buttons doesn't change
anything.   

32876

There is clearly a difference in how the volume controls are sent to the
receiver from the two different skins, but I am not sure how to sort
this out.  The Denon controller plugins also clearly impact how the
volume levels are set.  I am happy to troubleshoot the situation if
anyone has suggestions.  Thanks in advance for your help!


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