ROLAND Mobile Cube output solved (?)

Hello to everyone. After many years of searching, I thought I would give it a try unscrewing the screws and opening it up to see what's inside. What I found wasn't what I expected, since there were no soldered wire ends but everything was fit together with little plugs. Doing some tests though I figured out that the Jack hole for phones could work just fine whether you put a trs or a trrs jack. That means that you can have Sound no matter if you plug in 1 ring or 2 rings. So what I finally did was to plug a phones cable without putting it all the way in, in such a way that I could get sound both on the Cube's speakers and the headphones at the same time.
Don't judge me early enough. When we do this on other systems, we usually get a monophonic signal on the plugged in cable. Here, this was NOT the case!!! I got a STEREO signal , with good quality also on the headphones. Usually, if you do this on any device, you get poor Sound, leaving many frequencies outside, just like taking a karaoke version of the music,right?
I repeat, here this WAS NOT the case. The only thing I noticed was I slight boost of the Bass on the "half unplugged" headphones, but I still had stereo sound of good quality both on Cube's speakers and the external ones.
So maybe ROLAND made this on purpose and this is The way to have a muted or non muted cube if you plug a jack in The output hole? I really don't know, but it works.
 
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