/**
 * https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-voice#:~:text=Optional-,volume,-Indicates%20the%20volume
 */
export declare enum VOLUME {
    SILENT = "silent",
    X_SOFT = "x-soft",
    SOFT = "soft",
    MEDIUM = "medium",
    LOUD = "loud",
    X_LOUD = "x-LOUD",
    DEFAULT = "default"
}