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QU-16 offers a selection of the compression types / algorithms found in our iLive series.
Auto modes automatically adjust the attack and release according to the dynamics of the signal. Punchbag and Slow Opto are modelled over / inspired by two popular analogue units: a modern, transistor-based industry standard and a classic optical-based compressor respectively. The former is often used to add weight to kick drums and bass, the latter is frequently found on vocal chains, but there is no fixed recipe – it is mainly down to mixing style and engineer preference.
For more read up on compressor designs and peak vs. rms sensing you can start from here:
http://en.wikipedia.org/wiki/Dynamic_range_compression#Peak_vs_RMS_sensing
