Description:
Amplify, attenuate, limit, normalize audio to/by <gain>. Optionally 'balance' the gain levels of individual channels in multichannel audio.
<gain> specifies amplfication or attenuation in dB.
<options>:
'limit' will invoke a brickwall limiter, thus preventing the audio from clipping. NB: limiting more than a few dBs can cause audible distortion.
'normalize' will normalize the audio relative to 0dBFS; it is often used to normalize audio to a given level below 0dB.
'headroom' option is used to apply gain to provide head-room for subsequent processing.
'reclaim' option is used after a prior invocation of sox-level with 'headroom': if the headroom is not used by subsequent effects, it can be reclaimed with this option.
<balance-mode> specifies how the levels in different channels in multichannel audio are determined in order to change their relative levels.
NB: unlike 'peak' 'rms' might cause clipping in certain channels.
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