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Custom voices?

A Question for Half-Life

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Hello, I'm trying to make a map for half-life with a custom voiceline. I can make the npc say the sentence with the "scripted_sentence" entity. I can't make the npc's mouth move though. How do I do that?
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    access_time 18d edit 18d
    [This texts is taken from part of my answer regarding question submission titled "Why custom sounds don't play or loop properly?".]

    Supported sound settings:

    MONO: Half-Life doesn't support any Stereo sound file except Music files.

    22050Hz (High quality) (No Pitch)
    44100Hz=11025Hz (Low quality) (Supports Pitch)

    8 Bit  (Low quality+ (NPCs makes their lips move according to the audio file)  
    It doesn't have to be used only for NPCs.

    16 Bit  (High quality) (NPCs won't move their lips.)

    High quality settings:

    22050Hz 16Bit Mono: Weapon sounds, item sounds, custom sounds, ambience sounds. 
    (Except for NPCs that will make their lips move.)
    (Except for ambient sounds that increase or decrease the pitch over time.)
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    The sound must be compressed into a Mono, 22050Hz, 8-bit .wav file to make the lip sync work.
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