Start/stop Radias sequencer using Korg ESX... How to?

[acemonvw]

As the title suggests, I'm having difficulty figuring out how to start or stop the radias sequencer using the Korg ESX. I assumed that because they're both made by korg, they'd be able to talk to each other (the EMX and ESX talk perfectly to each other).

I want to push 'start' on my ESX and have the Korg Radias start playing its internal sequencers. I have both devices set to the same MIDI channel (1), I have all PCEN on, just in case. I thought this was a universal exclusive value, it even says it in the Radias. As per the Radias manual:

Ext-MIDI
The RADIAS will operate as a slave (the controlled de- vice) to MIDI clock messages received from the MIDI IN connector. The RADIAS’ step sequencer and arpeggia- tor will synchronize to the MIDI clock messages re- ceived from a connected external MIDI device. If the LFO1 and LFO2 “TempoSync” is On, the LFO cycle will synchronize to the MIDI clock of the external MIDI de- vice.

And:

Synchronizing the arpeggiator, step sequencer, modulation sequencer, and LFO
If the RADIAS’ arpeggiator is synchronized to a con- nected external MIDI device, you can use Start/Stop system realtime messages to control the arpeggiator and step sequencers.
Start [FA]
When a Start message [FA] is received, the arpeggiator will start from the first note that is played. The step se- quencers will start from step 1.
If the “Key Sync” of the modulation sequencer or LFO is turned off, the phase will be reset.
Stop [FC]
When a Stop message [FC] is received, the arpeggiator and step sequencers will stop. Since this is not an “off” message, the arpeggiator will start again when it is trig- gered.

This just alludes me. Any thoughts? I know the two devices are communicating because CC notes seem to work, as does tempo sync, note on/off... Curiously, Program changes aren't occurring (so if I change patterns on my ESX, it doesn't change patches on my Radias, though I suppose that makes sense).

[acemonvw]

Correction:

Only START/PLAY on the ESX doesn't seem to transmit (or the Radias doesn't listen). I can't figure out which. Otherwise, the other functions work (return to beginning, stop...)

[acemonvw]

Has no one ever tried hooking up a korg electribe to the Radias and used them this way? That would surprise me, considering there's a lovely spot on the keyboard for an electribe...

They seem well made for each other, but if one can't activate the Radias' sequencer using an electribe, it's not a good match :/