A nice, simple 3-band equaliser in 4HP - emphasise (or de-emphasise) your lows, mids and/or highs.
When you get down to it, all this module does is split an incoming signal through three different filters and the mixes the results back together again through an audio op-amp (LM833D in this particular case, others are available) - simple, but surprisingly effective. Works best at the end of your signal chain, but there's nothing to stop you putting it anywhere you like.
These units have a bit more flair than their predecessors - they've been fitted with Alpha potentiometers and Davies 1900h clone knobs.
Panels are laser-cut and engraved 3mm perspex in opaque black. Mounting hardware (M3x10 machine screws) and a power cable are also supplied.
If you'd prefer to fab your own panels, you can get the design files here: https://bitbucket.org/yorkmodular/eurorack-panels/src/master/FREQ2-panel/