Gyraf Audio G21 Magneto-Dynamic Infundibulum

Controls: Per-band clip control x3, overall clipper threshold with emphasis selector (linear/pink -3dB/oct/red -5dB/oct), fine-trim level for A/B, input low-cut selector

I/O: Passive processor, no power connector; three frequency-selective clipping bands plus overall clipper stage; input low-cut filter (2 selectable frequencies, 18dB/oct)

Notes: FINISHED product, current line (a manufactured passive unit, not a DIY-only design). Unusual for Gyraf: entirely passive with NO power connector required (powered='false' is explicit from source: 'no active circuitry or power connector required'), so it has no tube complement despite the brand's tube-centric reputation — flagged as notable. device_class judgment call: classified as 'Saturation / Character' (multi-band passive clipper/distortion tool) rather than 'Compressor / Limiter' since it works via parallel nonlinear clipping, not gain-reduction dynamics in the classic sense — flagged for review. Channel count 'stereo' taken from the homepage summary description ('fully passive, stereo, three band audio clipper'); the dedicated product page itself did not restate channel count explicitly. No USD price published. Rack height, frequency response, and year introduced not stated on site.