Aux return jacks 1, 2 [aux rtn 1, 2, Insert jacks 3, 4 [insert 3, 4, Balanced input connectors 3, 4 [input 3, 4 – Fostex FD-4 User Manual

Page 19: Recorder in jacks l, r [recorder in l, r, Midi out jack [midi out, Midi in jack [midi in, Punch in/out jack [punch in/out