The Multiband AGC section has two primary functions.
The first is to build RMS energy which increases perceived loudness and delivers a more "processed" sound when compared to the original source material.
The second is to provide spectral consistency to the processed audio. This is often called the "sonic signature" of a stream or station. Songs that are bass-shy (think 70's rock) receive a boost in the lower frequencies. Songs that are overly bright (think synth-heavy 80's pop) get their top-end smoothed out.
Band Energy (B1 – B5): The primary method of achieving a particular frequency balance of the Multiband AGCs. Higher settings result in higher output levels from that band.
Per-Band Compression Boost: Available by expanding the "More" menu, these controls adjust the drive and activity of the Multiband AGCs on a per-band basis.
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Figure 1 - Multiband AGC controls