The MMC record buttons object allows you to control the record-enable state of external MMC-compatible recording devices. (See MIDI Machine Control.)
Choose New > MMC Record buttons.
You can resize the object to determine the layout and number of track record buttons.
Select the Extra checkbox in the inspector to display the “V TC A1 A2” extra tracks:
V for Video
TC for Timecode
A1 for Aux Track 1 (or A)
A2 for Aux Track 2 (or B)