Need a design and prototype for an audio equalizer for use in professional recording studio or live sound applications. The purpose of the unit will be to provide eq to compressor sidechain circuits used in professional audio applications.

The circuit should:

Have 4 individual eq channels on a single circuit board that will fit in a standard 19" 1U equipment rack style chassis

Consist (per channel) of a high pass filter adjustable by knob from off progressively up to 400 hz. The slope of this filter should be adjustable between 12dB and 24dB per octave. Also per channel will be a single semi parametric filter adjustable from 1k Hz up to 9k Hz. with a switch for "wide Q" and "narrow Q" modes. This filter should boost or cut 12-15dB

Allow for balanced or unbalanced inputs and outputs and use 1\4" connectors

Utilize a separate decent quality "line lump" style power supply

Utilize traditional components rather than SMD

Utilize high quality components throughout.