Originally Posted by Mrs Beanbag
How does it not help anyone? You want to mix down your stereo output to mono, right? Well that's what it does, right?
You plug your headphones into that, and then you plug that into your Amiga.
edit: although thinking about it, you'd probably only get the mono signal in one ear, unless you were using mono headphones. or use a mono-to-stereo adapter as well.
edit2: or see this forum post http://eab.abime.net/showpost.php?p=956278&postcount=9
and look at the schematics to convince yourself that simply connecting left and right channels together is safe to do, since this is what the Amiga does internally anyway to create a mono output when only one phono socket is connected.
I'll leave others to vote on choosing between mono and 100% separated stereo by way of plugging and unplugging cables as the best option, and sort of keep sticking up for my suggestion of a headphone output that is usable.