BSS Audio OPAL Series DPR-422 Owner's Manual - Manual (Page 33)

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gain reduce.
Transient A sudden burst of energy in an audio signal which only lasts for a small period
of time relative to the rest of the signal. The level of these transients can often
reach 10 times (+20dB) or so above the normal operating level of the audio
equipment, and may cause distortion of headroom is inadequate.
Unity Gain Where output level is equal to input signal level.