Op Amps: Parametric EQ

At last, we reach the parametric audio equalizer. This version is based on the four op amp state variable band pass filter. It features independently adjustable center frequency, cut and boost, and Q (bandwidth). Before watching this video, it is strongly suggested that you watch the videos covering the other audio EQ circuits and the state variable filter in the Op Amps playlist.
References: Operational Amplifiers and Linear Integrated Circuits: Theory and Application; Chapter 11, sections 7 and 9.
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[@danielmusat597]

I use such SVT filter to separate bands in an audio device (cross-over). The transfer curve is perfect flat and sounds amazing. Maybe you could make some demonstration in this respect too.
Thank you for your effort! Means a world to many people!

[@Drums-and-Percussion-Grooves]

Great video, thank you!