get VOICE_INFO () {
        return {
            [ALTO_ID]: {
                name: formatMessage({
                    id: 'text2speech.alto',
                    default: 'alto',
                    description: 'Name for a voice with ambiguous gender.'
                }),
                gender: 'female',
                playbackRate: 1
            },
            [TENOR_ID]: {
                name: formatMessage({
                    id: 'text2speech.tenor',
                    default: 'tenor',
                    description: 'Name for a voice with ambiguous gender.'
                }),
                gender: 'male',
                playbackRate: 1
            },
            [SQUEAK_ID]: {
                name: formatMessage({
                    id: 'text2speech.squeak',
                    default: 'squeak',
                    description: 'Name for a funny voice with a high pitch.'
                }),
                gender: 'female',
                playbackRate: 1.19 // +3 semitones
            },
            [GIANT_ID]: {
                name: formatMessage({
                    id: 'text2speech.giant',
                    default: 'giant',
                    description: 'Name for a funny voice with a low pitch.'
                }),
                gender: 'male',
                playbackRate: 0.84 // -3 semitones
            },
            [KITTEN_ID]: {
                name: formatMessage({
                    id: 'text2speech.kitten',
                    default: 'kitten',
                    description: 'A baby cat.'
                }),
                gender: 'female',
                playbackRate: 1.41 // +6 semitones
            }
        };