volumeGainDb property
Volume gain (in dB) of the normal native volume supported by the specific voice, in the range [-96.0, 16.0].
If unset, or set to a value of 0.0 (dB), will play at normal native signal amplitude. A value of -6.0 (dB) will play at approximately half the amplitude of the normal native signal amplitude. A value of +6.0 (dB) will play at approximately twice the amplitude of the normal native signal amplitude. We strongly recommend not to exceed +10 (dB) as there's usually no effective increase in loudness for any value greater than that.
Optional.
Implementation
core.double? volumeGainDb;