With 16 tracks running, I honestly see no real need to make polyphonic recording on 1 track (using chord mode etc).
Polyphonic recording on a single track would be easier to realize than multi-track recording; I planned to go this way
what about:
1->2->1->3
and
1->2->1->4
or even
1->2->1->3->1->2->1->4
Unfortunately doesn’t comply with the handshaking concept I used for chain mode (see also comments about handshaking in seq_core.inc), I would have to think about a new solution, and overwork it completely. Would this really be worth the effort?
the “problem” is that they tend to “go out” and to create some madness when you repeatedly change the direction… i cannot explain very well.. but it’s quite obvious that, if you tweak with pendulum, expeimental progression, reverse, etc… you will for sure switch the accents on the beat. this could be annoying and not very “musical”.
I know what you mean - In such situations, I activate the “sync to measure” function in the clock divider page, until the track rolls over. Thereafter I deactivate this function again. I could also provide an additional “push-button solution”, but how should it be called so that nobody overlooks this feature?
I mean: you already overlooked the possibilities of “sync-to-measure”, no? 
Both those ideas are in my seq In the first one you can control the current step of a track with another track, and in the second you hold a button down and hit the step to jump to that step. It doesn’t reset the clocks though, that way it stays in sync; so you have to hit it before the step actually plays. I wonder if the MBSeq could do it? the first one might already be possible with the loopback ports, the second one I’m not sure…
Second one: “manual trigger” page
Btw.: you know, that my ToDo list works like a FILO? 
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Best Regards, Thorsten.