Studer Vista 1 Operating Instructions Manual page 146

Vista 1 Digital Mixing System
sC LInK intKey/extKey
3-34 Parameters
Four different possibilities are available:
All signal legs (L, R, C, Ls, Rs) are part of the sidechain link.
Only the L, R, Ls and Rs signal legs are part of the sidechain link.
Only the L, R and C signal legs are part of the sidechain link.
Only the L and R signal legs are part of the sidechain link.
The key source input can be selected from intKey (dynamics pro cessing
depends on the channel's own input signal, i.e. an internal key signal), or
extKey (processing is controlled by a signal connected via the patch, i.e. by
an external key signal).
SW V5.3 Document generated: 18.04.17