Control midish from MIDI controller using MMC

Hi,

how can I setup midish (on OpenBSD) so that it can be controlled
by MMC messages (start, stop, relocate) from an external
hardware MIDI controller?

I have tried something like the following and various other
setups without any success.

--
dnew 0 "rmidi/0" rw     # external MIDI controller
dnew 1 "midithru/0" rw
dnew 9 "snd/0" rw
dmtcrx 9

fnew control
fmap {any 0} {any 1}
--

Looking at the documentation it should be possible, but I just
cannot figure the correct configuration.

Regards
Dirk