Yamaha - CS6X , VL1 , Motif XS6 , Tyros 4 , MO8 , DX7S , HD-200 , SY55 , W7 - Stereo phone jack

Yamaha - CS6X - for phones, foot controller, foot volume
Yamaha - VL1 - for foot controller 1/2
Yamaha - Motif XS6 - for phones, foot controller 1 & 2, sustain
Yamaha - Tyros 4 - for assignable pedals
Yamaha - MO8 - for foot controller, headphones
Yamaha - DX7S - for fc1, fc2
Yamaha - HD-200 -   for foot pedal
Yamaha - SY55 -  for phones, foot volume
Yamaha - W7 - for foot volume, cont