CHNG only works for cued patterns, not for chains or song mode. latest version of the manual (updated a few weeks ago) explicitly states that CHNG is intended to work for “cued and chained patterns,” and uses that phrase a couple of times:
it is obviously intended to work on chains and in song mode, as would be perfectly intuitive for such a parameter. i was so excited when i read this section of the manual. unfortunately it does not work as intended, and also causes a delay when receive a program change (pattern change) midi message. there are loads of confused forum posts about both of these issues, going back years.
running latest OS, 1.40C on AR and 1.30B on A4. support ticket opened, i’d encourage everyone who enjoys polyrhythms to do the same.
also if anyone has any information or solutions for this, i would LOVE to hear it!