HUD

If I were to make a midibox devoted entirely to envelope generators (limited to ADSR's), such as those found in the analog toolbox or sidstation software, how many might I expect to make? Let's take 1ms update rate as a given, 16 or more with the new core? I understand that the analog output module might be the limitation in this example, but i'd be more than willing to build two of the better dacs and even multiplex their outputs (with s/h's, buffers, etc) to get double the cv's out. The analog and layout side of things does not worry me, so much as the software side. So, what do you think? How many decent (considering millisecond update rate) envelopes can be produced?