Global Tempo is used to make the tap tempo independent of each preset, so you can switch between presets and the tempo would be kept the same.
The default set up is to have global off….this allows you to set the tempo of each preset… so when you change presets the tempo will change as well.
To get Space to sync with an external MIDI clock you need to follow the procedure on page 43 of the user manual and set the function to ON…the default is OFF….
[MIDICLK IN] – MIDI Input Clock Enable (ON, OFF)
Press the Encoder to select. Turn Encoder to set MIDI Clock Receive ON or OFF. If ON, MIDI
Clock is used as a Tempo source.
hope that helps