Why would Chainer only accept Zxx but not PC Notes? Sending params via Zxx and PC Notes is done in the very same way, so there should be no difference at all. Since the record feature can only cover param changes, but no MIDI CCs and similar stuff, I fail to see the point here.

For some reason, Chainer can't send PC notes with Record Params. Perhaps because Chainer is exclusively MIDI based since all controls must be mapped to an internal (to Chainer) MIDI CC map.

Chainer of course is not the only VST i've been unable to affect or record params with PC notes.

If Chainer only works with MIDI CCs and not VST parameters, there is no way to use the Record Parameters function, no matter if you'd tell it to use \xx or PC notes. VST Parameters can be automated as defined by the VST SDK, MIDI CCs cannot.

Here's what we got. Chainer (just an example but there are others) foir whatever reason, used to enter Zxx commands in MPTM tracks with Record Params before Record Params was switched to enter PCEs in MPTM tracks. All i'm requesting is an option to use the old behavior.

Actually I cannot get Chainer to record any parameter changes in any format, even in OpenMPT 1.17. All I can tell is that the recording / detection code didn't change, apart from the actual code that enters the data into the pattern.

Renamed the issue, as this is actually what you really want. You said yourself that Chainer can only use MIDI CCs and not VST parameters, so obviously there should be a way to record MIDI CCs as well.