Behringer X32 - OSC - wildcard format

Hello,

So I'm trying to get Reaper to talk OSC directly to my X32. So far easy, I created a simple X32.ReaperOSC file and edited the file to report a fader/volume change in Reaper to my X32. It "kinda" works:

TRACK_VOLUME n/ch/@/mix/fader

effectively sends a correctly formatted, normalized float to the X32. But the X32 does not accept it because it expects "01" and not "1" for the first channel.

Is there a way to enure wildcards would generate a fixed format (sort of %2d)?

Thanks,
-Patrick