Calrec S2 Operator's Manual page 26

S2
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2.8 IG4062 VCA GROUP TWIN FADER
Scribble strip.
FADER - with +10dB in hand - can be reverse scale to order.
CUT button cuts channels & groups selected to VCA fader illuminating their LEDs.
Yellow LED.
AFL button puts channels & groups selected to VCA fader to the AFL monitor
illuminating their LEDs. Red LED.
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