Hi Norman, Geoff, etc.,
Here goes!
Open the EMX1 manual at page 84, refer to the right hand side and the section "About the MIDI messages used for synchronisation".
Read "Realtime Messages" used ... (it should really say that these are MIDI System RealTime messages as found towards the end of Table 1 in the MIDI specification.)
MIDI timing clock = F8 (that's Hexadecimal so should be written F8H)
Start = FAH
Continue = FBH
Stop = FCH.
That's it for the basic control.
So Cubase should be set to send out the MIDI timing clock so that it controls the timing, and the drum machine set to synchronise to the Cubase clocks, (as detailed in the EMX1 manual.)
So, we need to insert the appropriate realtime control message within the MIDI file at the beginning of measure 20 using Cubase.
Well, Cubase I don't have any more, but using the freebie Anvil Studio, I open track 1 (assigned to MIDI channel 1) and Edit, Insert MIDI event.
I need to select the option to "show all controller events" then I can select - "Start".from the drop down list.
Adjust the Measure, Beat, Tick to the position required, i.e. "020.01,000 ", hit Enter ... job done.
So, attached you'll find a zippped file "MCI-Commands".
Unzip it and you'll find a format 1 MIDI file.
Within it at measure 20 is a start command
Followed by a stop then a continue ... or something like that !
It's just possible that Cubase calls this event type an "MCI" event (Machine Control Instruction).
The next page of the manual goes into Song Selection and Song Position Pointers, but you didn't ask about that!
"About Synchronisation in Song mode."
Now, that wasn't rocket science, was it? ;-)
Hope that helps?
JohnG.