SA Parametric EQ

A five-band parametric EQ built as a precision instrument rather than a stack of sliders. The magnitude curve is the interface: drag a band on the curve, and its colour follows through to its knobs and its title strip.

What it does

• Low cut, three fully parametric peak bands, high cut
• Interactive response curve with a live spectrum analyzer behind it
• Per-band colour coding — five bands read apart at a glance
• 20 Hz–20 kHz, −30…+30 dB, logarithmic
• VST3 and AU

How it is built

The DSP lives in sa::dsp, the shared real-time engine behind every Sombra plugin. The audio thread allocates nothing and takes no locks; the display designs its own coefficients from parameters rather than reading the live filter state, and the analyzer drains a lock-free tap on the message thread.

Free to download and use. Built for experimenting — feedback welcome.