This article explains SC Voice in Knives Out (mobile battle royale). It covers setup methods, usage, how to mute, and more, so use it as a reference.
Table of Contents
What is SC Voice?
Voice for Quick Information Sharing

SC Voice allows you to instantly display preset lines with a single tap. In addition to default voices, you can switch to collaboration-exclusive or gacha-exclusive voices.
How to Set Up SC Voice
Set from "In-Combat Chat"

You can change SC Voice by selecting "In-Combat Chat" from the settings. Tap "Change" at the bottom of the screen and select the voice you want to set from the list on the right.
You can create up to 3 lists

You can create up to three SC Voice lists, and since you can choose SC voices from all lists during combat, you can use a total of 24 types of SC voices. Use them by switching lists according to the situation.
How to Use SC Voice
Use From the Icon Next to the Minimap

Tapping the speech bubble icon next to the minimap will display the list of set SC voices. You can use them by tapping the voice you want to use from the list.
Recommended SC Voices
For Signaling an Attack

When you spot an enemy nearby or want to attack, signal your teammates with SC Voice. This clearly communicates your intention to attack, making it easier to fight cooperatively.
For Signaling a Retreat

When targeted by multiple parties or when a teammate is knocked out and you're at a disadvantage, signal a retreat and escape. If you flee without saying anything, your teammates might end up fighting alone, or conversely, you might be targeted when isolated, which is very dangerous.
How to Mute Teammate
Tap the Chat Icon on Member Screen

If you want to mute a teammate's SC Voice, tap the teammate's name and then tap the speech bubble icon This will prevent that teammate's CS voices from being displayed.