you would need to go into the System menu>…
turn the knob to MIDI> press the knob…..
Make a note of what MIDI Channel the TimeFactor is listening on eg 2
Turn the knob to [RCV CRTL] press the knob
Turn the knob to [BYP] (Bypass) then set a value if one is not set eg…4
Save the setting
then on the Roland controller, set button 4 to transmit MIDI CC value 4 on Channel 2.
(I do not know the Roland controller though)
Hope that helps