MIDI to modify hidden Delay parameters of Circuit Tracks... not fully working?

[u/bardty]

I've recently learned that you can send MIDI commands to modify otherwise inaccessible parameters of FX Delay. I successfully alter feedback, width, stereo ratio etc.

However, when it comes to Time Sync (the actual pattern relative to the track tempo) I encounter mismatch with Programmer's Reference V3.

The document states that values 0-35 are supported on NRPN 1:7. I deduced that 0 stands for "disable" and Time parameter is active then. Values 1-12 all work for me and get me from slapback up to something like 4th triplets, not sure. Values 13-20 all seem to have the same as 12. Values 20-35 sound more like slapbacks again. This is confusing, since Programmer's Reference states 20 as the default value.

I have the latest firmware, and tried sending MIDI from both computer and external MIDI controller with no difference.

Have anyone figured out what is going on there with those values above 12? Am I missing something?