Three-band inductive equalizer with tone control and transformer power.
The Model 51 EQ is a distinctive three-band inductive equalizer designed for bold, musical sound processing without sacrificing detail. Its fixed frequency ranges and carefully modeled frequency response make it quick to use: add weight, bring a source to the foreground, soften harshness, or open up the highs with wide, natural curves that are immediately ready for mixing.
It’s designed to fit seamlessly into tracks, buses, stems, and the mix bus: wide enough for quick tonal correction, but with enough control for more targeted correction work when needed.
The plugin features a clean EQ path for predictable curves, as well as an analog mode in which the EQ reacts more like a controlled circuit.
Input level, band gain, analog drive, amp stage, tone, and transformer allow you to adjust the clarity or dynamics of the EQ’s sound. It can remain smooth and high-quality, or become more assertive, tight, and responsive when you press the pedal.
Main characteristics
- Five-band EQ: Body, Weight, Presence, Focus, and Air.
- Clean and analog EQ modes.
- Analog control mode that monitors the input signal level and the amount of gain applied to the frequency band.
- Extended Drive option provides a tighter op-amp response at a higher processor cost.
- Gain stage for more detailed signal path shaping.
- Phase inverter and color stages for an additional analog sound.
- HQ/Auto oversampling mode for cleaner high frequencies when working with the analog stages.
- Stereo, dual mono, and Mid/Side modes for graphic display/editing.
- Mono-specific processing of mono tracks to reduce CPU load.
- Input and output signal adjustments with feedback capability.
- Temporarily link feedback trim using Shift-drag.
- Delta Listen is designed to hear only the processed difference.
- Built-in FFT analyzer with selectable speed, block size, and audio smoothing.
- Graph scale options: +/- 12 dB, +/- 6 dB, and +/- 3 dB.
- Right-click on an empty area of the graph to quickly change the graph zoom.
- Band menu items must be accessed by right-clicking on graph nodes.
- In the low- and high-frequency ranges, you can switch between shelving and peaking waveforms.
- Q control with the mouse wheel on supported graph nodes.
- Briefly enable solo mode by holding the Shift key over graph nodes.
- A/B comparison with A>B copy.
- Compact view.
- 85 factory presets included.
- User manual available in the plugin menu and in the DMG installation file.
The plugin can be quite processor-intensive when all analog stages are enabled and the quality is set to high. Therefore, most of the resource-intensive modeling can be enabled as needed.

- Download Insert Audio – Insert EQ 33 v.0.2.1 VST3, AAX x64 [09.17.2026](MOCHA)
- Original Publisher: Insert Audio
- Version: v0.2.1
- Format: VST3, AAX
- Category: VST Plugins
- Require: Windows 10+
- License type: Full
- Download Size: 7 MB

