maybe it's been said, but...
i would personally love to see this module with the addition of:
a mute switch for each channel
a master stereo volume knob
a simple stereo horizontal led (an led for each channel would be great
but i don't want to push it).

sure, i have a mixing board. in fact i have a few but there's no
reason my modular should be dependent on another piece of gear
(especially when you can make a modular do practically anything) for
such a simple operation. besides, it's nice to have it all in one
convenient location.

i have been tempted in the past to buy a cheap tapco (or worse) mixer,
gut it and modularize it. you can buy a nice, cheap 6 channel mixer
w/eq's, mutes, headphone out,(some even have xlr outs)etc. for $100 or
less. granted, this may not be the purpose of the a-135-2, but then,
what is it why stop short