How difficult would it be to add another 8 analog outs for a total of 16 analog steps? I am trying to decide whether to build a MIDIbox SEQ or just to go with an analog sequencer. I only have a few digital synths and those already have sequencers built in (DSI evolver & PolyEvolver).
The J5 analogue outs are just gates, so you can use them on their own to trigger old school sequencers or arpeggiators in synths like SH-101's or Juno 60's etc.. If you need more than 8 gate outs, then you can install an extra DOUT board and get something stupid like 48 extra trigger outs, however these have (I think) a fixed duration of 1ms, unlike the J5 Gate outs (8 of them) which can be any length you wish.
From reading you post, I think you might feel the 8 gate outs are for a different purpose than what they are.. they are not used in the same way as an analogue sequencer, more like another way of triggering things.
I think that the MB-SEQ is waaaaaaaaaay better than the PolyEvolvers... well, in my limited time of using the DSI stuff.. your results may vary... I use my SEQ's to control quite a bit of kit, both analogue & digital.