Elektron Analog Four - Manual (Page 99)

Appendix C: CV TRACK PARAMETERS C-3
CV (TRIG)
SRC (Source Track) selects the track whose notes should be
used for sending trig signals. The CV track, FX track and synth
tracks 1-4 can be used as source.
CV (GATE)
SRC (Source Track) selects the track whose notes should be
used for sending gate signals. The CV track, FX track and synth
tracks 1-4 can be used as source.