transform_vol.RdAdd a volume to an waveform.
transform_vol(gain, gain_type = "amplitude")(float): Interpreted according to the given gain_type:
If gain_type = amplitude, gain is a positive amplitude ratio.
If gain_type = power, gain is a power (voltage squared).
If gain_type = db, gain is in decibels.
(str, optional): Type of gain. One of: amplitude, power, db (Default: amplitude)
Tensor: Tensor of audio of dimension (..., time).
forward param: waveform (Tensor): Tensor of audio of dimension (..., time).