I’m now testing UPnP function of the TuneBrowser with Audiophile UPnP Renderer again, but it seems almost works well. Of course, this is not perfect, as the Renderer may not recognize the command depending on the timing of the control.
And from this situation, I don’t think that TuneBrowser has a major problem.
I will contact DENON again and let them know of storaid’s sadness.
I hope there will be some progress.