[CUBASE] How to map the transport buttons of my Laboratory keyboard in Cubase ?

First, you must configure your Laboratory keyboard to send MMC (MIDI Machine Control) messages:

• Open The Laboratory MIDI Control Center (update to 1.0.1 or later)
• Select PLAY button
  • Set Mode to MMC
  • Set CC Number to 2 (CC Number will be the MMC command sent)
• Select STOP button
  • Set Mode to MMC
  • Set CC Number to 1
• Select RECORD button
  • Set Mode to MMC
  • Set CC Number to 6
• ... Please refer to http://en.wikipedia.org/wiki/MIDI_Machine_Control MMC Messages for further details about MMC messages
• Click "Send to keyboard"

In Cubase  6

• Open Transport > Project Synchronization Setup > Machine Control Input section
  
• Click "MMC Slave Active"
• In MIDI TimeCode Source Section
  • MMC input :  ALL MIDI Input
  • MMC Device ID : 127
• Click Start/Stop on your keyboard to check that it works