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User Guide
Is there a user guide somewhere that explains each setting and what it does?
All I could find for UAPP Toneboosters user manual was in the full Toneboosters manual 2015, at . This manual describes the extensive complete Toneboosters parametric EQ system, which has a LOT of bells and whistles. The version embedded in UAPP is much reduced in complexity and scope, and seems to be only partially covered in the manual. 

Section 7.3 - User Interface, starting on page 29, combined with my interpretation:

6 filter sections with several controls to modify their behavior

Note: all 6 filter sections are always processing the audio signal whether or not the filter section amplitude or gain is set to 0. 

Also: Bit Perfect is automatically inhibited when Toneboosters EQ is enabled.


Filter type: Select  the filter  type  of  the  current  section - low frequency pass (low shelf), high frequency pass (high shelf),  bell  shape (analog bell, digital bell, digital bell 2 (more sophisticated digital bell)), blocking filter, etc.

Frequency: Sets the frequency of the currently selected section.

Gain: Sets the gain (in dB) of the current filter section (gain (+), cut (-)).

Quality Factor (Q): Sets the quality factor of the current filter section. This sets the bandwidth and rise/fall characteristics of the filter. A higher Q value means a narrower bandwidth/greater resonance or ringing or peakiness (depending on the filter type). About 0.72-0.73 seems to be critical or optimal damping (steepest rise/fall time/frequency slope that can be combined with no ringing). The tradeoff is that larger values of Q produce narrower band filters that can damp out narrower band mechanical/electrical resonances in the transducer with lesser effect on adjacent frequencies, at the cost of ringing and peakiness.

Mode: Determines whether the section applies its processing in stereo, left only, right only, mid only or side only channels.

Amount: Sets the amount of processing for the current section. 0% means that the filter is not being applied; 100% indicates full processing.
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