Yamaha SY85 Owner's Manual (feature Reference) (image) - Page 212

Local Range: off, on Controls: [CS8], [-1] [+1], Dial, "Local control" refers to the fact that, normally, the SY85 keyboard controls its internal tone generator, allowing the internal voices to be played directly from the keyboard. This situation is "Local Control ON" since the internal tone generator is controlled locally by its own keyboard. Local control can be turned OFF, however, so that the keyboard does not play the internal voices, but the appropriate MIDI information is still transmitted via the MIDI OUT connector when notes are played on the keyboard. At the same time, the internal tone generator responds to MIDI information received via the MIDI IN connector. UTILITY MODE / SYNTH SETUP 211