I am not following the above advice
Let me make clear. If I want to export stems, I don't want every single track. I just want the main buses (e.g. kick, main perc, additional perc, mid synth, hi synth, ambient sounds, fx buses). I don't want all the tracks inside these groups (snare, hats, toms, more toms, yet more toms, claps, more toms... um, you get my drift).
If I turn these sub group tracks off as suggested above, they will not render, period, and they will be missing from the buses.
So having an option to checkbox which track I want out (and possibly which I want stereo, mono, etc) would be very useful.
The current setup does not bother me. I only have to send stems to a mastering engineer when I actually finish a track, which is once every second blue moon in years beginning with R. But if someone was using Live intensively and professionally to render such stems, the current setup is far from ideal...