Version 1.0.0 · Last updated March 2026
Tonality EQ is a creative, layer-based equalizer with perception-driven global controls. Rather than only offering traditional parametric bands, it provides four tonal shaping controls (Tone, Weight, Focus, Character) that address how you perceive frequency balance, plus a full ADSR envelope shaper for transient and sustain control.
Beneath the global controls sits a layer-based EQ system with five distinct filter modes: Surgical EQ, Balance EQ, Phase EQ, Harmonic EQ, and Overtone EQ. Each layer operates independently while the global controls shape the overall tonal character.
Tonality EQ was built around three principles:
Audio passes through Tonality EQ in this order:
Clockwise (Exciter): Extracts high-frequency content using a fixed high shelf at 4 kHz, then applies harmonic saturation to generate new overtones in the upper range. The result is added sparkle and presence without simply boosting the treble. At higher settings, the exciter generates audible harmonic shimmer.
Counter-clockwise (Tape Warmth): Applies gentle low-pass filtering combined with subtle tape-style saturation, including mild even-harmonic distortion. This progressively softens the high frequencies and adds a warm, slightly compressed character reminiscent of analog tape.
At center: No effect. The filter states are maintained internally so there is no click when the control is moved away from center.
Use small TONE values (0.1 to 0.3) for subtle tonal shaping. The exciter side is particularly effective on dull sources that need air without a traditional high-shelf boost.
Clockwise (Sub-harmonics): Adds low-frequency weight through two mechanisms. First, a fixed bell filter at 55 Hz (+6 dB) is crossfaded in, reinforcing the fundamental low end. Second, a sub-harmonic synthesizer generates content at approximately 40 Hz by rectifying the low-pass filtered signal and driving a sine oscillator. The sub-harmonic content fades as the control approaches maximum to avoid excessive rumble.
Counter-clockwise (Transient Punch): Emphasizes transient content using level-sensitive detection. Transient peaks are momentarily lifted to add punch and snap, while sub-frequency content is gently attenuated to tighten the low end.
At center: No effect. All internal filters continue processing to maintain state continuity.
Clockwise (Upper Mid Clarity): Crossfades toward a fixed bell filter at 2 kHz (+5.5 dB, Q 0.7). This brings forward the presence and clarity range, making vocals cut through a mix and giving guitars more bite.
Counter-clockwise (Lower Mid Warmth): Crossfades toward a fixed bell filter at 1 kHz (+5.5 dB, Q 0.6). This fills out the lower midrange, adding body and warmth to thin-sounding sources.
Both bell filters run continuously, and the Focus control blends between them. This ensures no clicks or artifacts when sweeping through the range.
Controls the overall intensity of the saturation stage. At zero, no saturation is applied. As the control is increased, the signal passes through a combined tape and tube saturation model with pre-saturation coloring (tape head bump at 80 Hz, tube mid bloom at 1500 Hz) and post-saturation gain compensation.
The saturation stage supports 2x and 4x oversampling to reduce aliasing at higher drive settings. Oversampling can be toggled in the plugin settings.
Tape character (negative Bias): Soft, symmetric saturation via tanh waveshaping with moderate drive. Adds gentle 2nd and 3rd harmonics. Pre-saturation bass lift via head bump filter. Post-saturation high-frequency rolloff increases with drive, producing the classic analog tape warmth.
Tube character (positive Bias): Asymmetric clipping with a higher drive range. The positive signal half compresses gently while the negative half clips harder, producing strong even-harmonic (2nd harmonic) content. Pre-saturation midrange bloom at 1500 Hz adds the characteristic tube warmth. More dynamic and forward-sounding than the tape side.
Start with CHARACTER at 0.2-0.4 and sweep the BIAS to find the right character for your source. Tape tends to work well on full mixes and buses. Tube brings out vocals and solo instruments.
The ADSR section is a transient designer with full envelope control. It responds to short, punchy level changes and reshapes gain to emphasize or soften them.
Controls how transient peaks are treated. Positive values boost detected transients for more punch and snap. Negative values attenuate transients for a softer, rounder sound. The detector listens for brief level changes and reacts according to the ATTACK, DECAY, and RELEASE settings.
Controls how quickly the detector relaxes after a transient. Short decay values make the transient shaping more focused on the immediate attack. Longer values extend the effect into the early sustain portion of the sound.
Controls the gain applied to the sustained portion of the signal (the part that remains after transients). Positive values bring up the body and tail of sounds. Negative values reduce the sustain for a more transient-focused presentation.
Controls how quickly gain recovers between transients. Short release values reset quickly between hits. Long values create a more compressed, even dynamic profile. This interacts with DECAY to define the overall envelope shape.
Adjusts the input level before any processing. Use this to drive the saturation stage harder or to attenuate hot signals before they reach the EQ layers.
Adjusts the final output level after all processing. Use in combination with Auto Gain for precise level matching.
Blends the processed signal with the original dry signal in parallel. This is useful for parallel EQ and saturation techniques where you want to retain the natural dynamics while adding tonal color.
When enabled, Tonality EQ automatically compensates for perceived loudness changes caused by EQ and saturation. It uses a 400 ms RMS comparison between input and output levels with smooth attack/release tracking. This makes it easier to evaluate tonal changes without being biased by volume differences.
The layer system is the parametric EQ core of Tonality EQ. Each layer is an independent EQ instance with its own bands, and layers are processed in series (top to bottom). You can add, remove, reorder, rename, and solo/mute individual layers.
By default, Tonality EQ creates five layers on initialization, one for each type. You can add more layers or remove ones you do not need.
Traditional parametric EQ with precise frequency, gain, and Q controls. Use for corrective work: removing resonances, notching problem frequencies, or making surgical adjustments that need exact control.
Broad, gentle EQ curves designed for overall tonal balance. Wider Q values and smoother slopes make it suited for shaping the general frequency profile without creating sharp peaks or dips.
Phase-aligned filtering that shapes the frequency response while maintaining phase coherence. Useful when phase relationships matter, such as when processing parallel signals or when stacking EQ on multiple related tracks.
Frequency-dependent harmonic enhancement. Rather than simply boosting a frequency, Harmonic EQ generates new harmonic content in the targeted region, adding richness and presence in a way that a linear EQ cannot.
Targets the overtone structure of the signal. Useful for enhancing or attenuating the harmonic series above a fundamental, which can change the perceived timbre without affecting the fundamental frequency itself.
| Plugin format | AU (Audio Unit) + VST3 |
| Platform | macOS 11.0 (Big Sur) or later |
| Architecture | Universal Binary (Intel + Apple Silicon native) |
| Internal precision | 64-bit floating point |
| Latency | Zero latency (no lookahead buffer) |
| RAM | Minimum 4 GB |
| License | One-time online activation, up to 3 machines |
| Tested DAWs | Logic Pro, Ableton Live, Reaper, Cubase, Studio One, Nuendo, and all AU/VST3-compatible hosts |
~/Library/Audio/Plug-Ins/Components/ for AU, ~/Library/Audio/Plug-Ins/VST3/ for VST3.Need more help? Contact us at hello@buchertaudio.com