Quote - This might be much more than useless trivia if such a zero delta channel could be loaded via PMD as a new channel. unfortunately it can't, and this is useless trivia, as under the circumstances using valueParm is a better solution.

Actually it is a useful bit of info, as I was thinking that a simple fix might be to just correct the number of deltas (seemed likely to be more amenable to scripting).
It looks that you need to do that and add at least one dummy delta.

(Note to self, time to poke at the PMD format)