Varco

There's no practical difference between stereo and dual mono input in this scenario. The HX One can't detect what's at the other end of the audio cables to know if it's connected to a single stereo device or two mono devices.

I did see that, although I read that paragraph as focused more on stereo vs insert mode rather than stereo vs mono operation. And if you follow its lead to the Settings View section of the manual, the text on I/O config goes on to say "Note that if no cable is connected to the OUT - RIGHT jack, your HX One output is folded to mono." But supposing you are correct that stereo operation defeats the blended-mono output, I'm confused why they'd be mentioning folding to mono at all (which shows up three separate times in the manual). By nature, we'd need to be in stereo operation to have anything to fold to mono. If there's only one input connected, we're already in mono. Admittedly, nobody would probably ever use stereo inputs with a mono output except in the case I mentioned above with two different instruments - which is exactly what I was hoping to do. I think I'll open a support ticket and see what they say.

The HX One manual states that if only the L/Mono output is connected, the audio output will be folded to mono. This doesn't seem to be the case on my HX One. Only the left output is passed through when two inputs are connected. I can demonstrate this by plugging two different instruments into the L and R inputs and a single cable from the L/Mono out. The instrument in the right channel doesn't come through the mono output as you'd expect if it was being folded to mono. Is this just me? Is there a setting I'm missing?