If computer keyboard is connected it is used to send MIDI commands. Otherwise, looper searches for MIDI input with specific names provided in configuration file. If nothing is found looper starts anyway but may not be controlled. Look at log file via looper's web page to check if MIDI input is found and connected.
;midi_in_names -- names (or part of names) for MIDI input controls, case-sensitive
midi_in_names : BlueBoard, FootCtrlPlus
;keyboard_keys -- keys on computer keyboard if using keyboard as MIDI IN
keyboard_keys : 1, 2, 3, 4, q, w
;keyboard_notes -- MIDI notes (or CC) sent by each button, integers from 0 to 127
keyboard_notes : 60, 62, 64, 65, 12, 13
Notes are labeled: A, B, C, D, E, F, G, H... and they correspond to integer values in keyboard_notes option in the [main.ini]