SEQ-ST from NUGEN Audio is an equalizer for stereo and mid/side work, built around matching and inverted match curves rather than a traditional parametric layout.
SEQ-ST at a glance
| Developer | NUGEN Audio |
|---|---|
| Type | Effects / EQ |
| Formats | VST3, AU, AAX |
| Operating systems | Windows Vista or later, macOS 10.9 or later |
| Architecture | 64-bit |
| Free trial | Available |
| Price on Plugin Boutique (October 2026) | €143.79 |
What SEQ-ST does
Instead of placing individual bands by hand, SEQ-ST gives control over the spatial environment of a mix through stereo and mid/side operation. Independent left/right and mid/side processing can run side by side inside the same instance, so each channel can carry its own corrections.
The matching function derives an EQ curve from a reference, and inverting that curve carves out space for a sound in a busy mix, which the developer describes as a minimally invasive technique. Flexible, detailed envelopes can be fine-tuned in ways the developer contrasts with traditional parametric editing, and precise corrections that would take time in a parametric interface can be made more quickly. The developer also lists a way to nudge a sound gently toward reference material.
Key features
- Stereo and mid/side operation. The plugin processes stereo material and mid/side signals, and the spatial environment can be shaped through either approach.
- Independent left/right and mid/side. Left/right and mid/side processing run independently and can be used together within the same instance.
- Matching EQ. A matching function builds an EQ curve from reference material so the sound can be pushed gently toward that reference.
- Inverted match curve. Inverting the match curve carves space for a source, for example dialogue in a busy soundtrack, without heavy-handed cuts.
- Detailed envelopes. Fine-tuned envelopes allow more flexible and detailed shaping than a traditional parametric interface.
Use cases
- Carving space for dialogue. The inverted match curve can open a slot for dialogue in a busy soundtrack, as the developer describes.
- Broadcast corrections. Precise corrections that would be time consuming in a traditional parametric interface can be made quickly, according to the developer.
Compatibility
The plugin comes as VST3, AU and AAX for Windows and macOS (64-bit). Minimum OS is macOS 10.9 and Windows Vista.
Who it is for
Music producers, mix engineers and broadcast post-production engineers who want stereo and mid/side EQ with matching-based curves. A trial is available.
SEQ-ST compared with similar plugins
Alternatives in the same EQ category differ in formats and operating systems. BALANCE by Zynaptiq is an effect for VST3, AU and AAX on Windows and macOS. Things – Flip EQ by AudioThing is available as VST3, VST2, AU, AAX and CLAP on Windows and macOS.
| Plugin | Developer | Type | Formats | Systems | Price |
|---|---|---|---|---|---|
| SEQ-ST | NUGEN Audio | EQ | VST3, AU, AAX | Windows, macOS | €143.79 |
| BALANCE | Zynaptiq | EQ | VST3, AU, AAX | Windows, macOS | €170.17 |
| Blackboard EQ | CalPochi | EQ | VST3, AU | Windows, macOS | €78.34 |
| Lurssen Mastering EQ | IK Multimedia | EQ | VST3, VST2, AU, AAX | Windows, macOS | €118.99 |
| Things – Flip EQ | AudioThing | EQ | VST3, VST2, AU, AAX, CLAP | Windows, macOS | €18.84 |
Price and availability
SEQ-ST was listed on Plugin Boutique in October 2026 at €143.79. A free trial is offered. Prices change often, so the store page shows the current one.
SEQ-ST FAQ
Is there a working serial key or keygen for SEQ-ST?
Queries for SEQ-ST most often pair the name with keygen and serial key, but the developer does not publish such keys.
Which formats does SEQ-ST support?
The plugin is available as VST3, AU and AAX, with the AAX build listed alongside the others for Windows and macOS.