Garuc Audio iBiZA [WiN]

• Product: iBiZA
• Developer: Garuc Audio
• Version: 1.0.1
• Format: VST3, AAX
• Requirements: Windows 10 or later
• Source: garucaudio.com

Mastering equalizers rarely let an engineer choose a frequency by note name instead of a number. iBiZA does, which is why it’s the subject of this review: Garuc Audio’s four-band EQ centers each band on a musical pitch, not a raw Hz value, then runs the signal through modeled Class A circuitry and a “Color” circuit built around transformer-style line amplification. A dual-slope low cut and a global tilt knob round out the path, positioning iBiZA as a tonal-shaping stage in a mastering chain rather than a full channel strip.

Key Takeaway

iBiZA’s differentiator is selecting EQ frequencies by musical note across four bands, each pairing that pitch-based selector with a dual-slope low cut and a modeled Class A “Color” circuit for analog-style warmth. It stops at tonal shaping — no compression or limiting stage — and the free trial runs through an account-gated 15-day license rather than an instant, no-signup download.

Four Bands, Tuned Like Notes

Each of iBiZA’s four bands centers on a musical note rather than a Hz figure, and the +1 Step button nudges that selection up by one increment when the target sits between two named pitches. Bandwidth and gain stay on their own knobs, so widening a band’s curve doesn’t shift which note it’s built around. Bands 1 and 2 can switch to low shelf and high shelf, turning the two outer bands into broad tonal moves instead of centered bell curves.

Each band also carries its own color activation button, so the modeled analog coloration can sit on one band with the other three left clean. That’s useful on a master where only the low-mid needs warming and the top end needs to stay transparent. Four bands is the ceiling — there’s no fifth band or a dynamic EQ mode, so a busy master needing three or four surgical notches at once runs out of room here.

Producers who already think in scale degrees rather than spectral analyzer readouts get to work faster with this layout. Anyone used to typing exact Hz numbers into a plugin will spend the first session translating pitch names back into frequency before trusting the selector by ear.

Parallel Filters and the Color Circuit

iBiZA models discrete Class A analog circuitry and runs its bands through a parallel filter architecture, meaning each band’s curve stays independent rather than cascading through the next one the way a serial EQ chain does. Engaging Color on a band routes it through modeled transformer-style line amplification, adding the warmth and dynamic-range character the parallel path is built to preserve.

Color’s depth is set by a single algorithm intensity knob shared across every active band, not a per-band amount control. A mix that needs heavy saturation on the low end and a lighter touch up top has to settle for one shared setting or leave Color off on the band that doesn’t need it. Engineers building a full analog-style pass across the whole spectrum get more out of this than someone chasing one narrow, band-specific coloration move.

Two Speeds, No Slope In Between

The low cut runs at 12 dB per octave by default, and the +1 Step button steepens it to 24 dB per octave — the filter’s only two rolloff options. There’s no continuously variable slope in between, so a gentler 6 dB or steeper 18 dB cut isn’t available from this control; a separate high-pass tool covers anything outside those two points.

The pitch tilt knob shifts the whole spectrum’s balance toward bass or treble in one gesture, working as a macro move before the four bands handle anything more specific. It’s fast for correcting a master that leans dark or bright overall, but it isn’t frequency-selective — pulling down harshness at one specific pitch still means going back to the band section rather than staying on the tilt knob.

Reading the Bands Against the Output

The channel display pairs a real-time output spectrum analyzer with per-band EQ information, so a note-based boost or cut shows up against the actual output curve rather than requiring the engineer to trust the selector alone. Input and output gain meters sit alongside it, and an adaptive grid rescales between a normal view and a mastering view depending on which mode is active.

The mastering view’s finer grid makes small boosts easier to read at a glance during a final tonal pass, where a half-dB move matters more than it does earlier in a mix. What the display doesn’t include is any stereo correlation or phase meter — an engineer running heavy mid-side moves elsewhere on iBiZA still needs a separate correlation meter alongside it to confirm the stereo field stayed in phase.

The Headroom Knob’s Stopping Point

DSP headroom calibration sets how much level the parallel filters and Color circuit can absorb before the modeled Class A stage starts to saturate — it governs internal gain staging into the analog modeling, not how loud the finished master reads against a target. Input and output trim run ±10 dB each, Mastering Mode and All Color switch the whole plugin’s context in one click, and Channel Link ties both sides of a stereo pair to matching moves or lets them run independently when switched off.

The LR-MS toggle re-routes every band and the low cut from left/right to mid/side, turning ordinary tonal moves into stereo-width decisions instead. None of this reaches into dynamics — there’s no compression or limiting stage anywhere in iBiZA’s signal path, so a mastering chain built around it still needs a separate tool to set the final loudness ceiling once the tonal pass is done.

Try iBiZA’s demo before you buy — the download link is at the top of this page. The demo gives you the same four-band, note-based EQ as the full release, with the Color circuit and both low-cut slopes fully active. The only difference is that it hasn’t been unlocked with a license key yet.

If you like what you hear, the full version is available from Garuc Audio’s official store as a one-time purchase, with no subscription, dongle, or ongoing activation.

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