OptionallengthSpeech-rate multiplier (>1 slower, <1 faster).
OptionalnoiseVoice variability (output is stochastic).
OptionalnoiseTiming variability.
OptionalnormalizeScale PCM to peak before output. Default: true.
OptionaloutputWhen set, the final audio is also written to this path.
OptionaloutputOptionalsentenceOptionalspeakerSpeaker index for multi-speaker/style models.
OptionalvolumeGain multiplier applied after normalization. Default: 1.0.
Per-synthesis overrides: synthesis params plus silence gap and output format.