Fazertone Furnace [WiN]

• Product: Furnace
• Publisher: Fazertone
• Version: 0.0.1
• Format: VST3, AAX
• Requirements: Windows 7 or later
• Source: fazertone.com/plugin/furnace

Furnace by Fazertone (The/Audio/Firm) is a saturation and color-box plugin by mixing engineer Sean Feder and developer Vic from Phaserone that models three distinct analog saturation circuits: 456 tape emulation, transformer saturation (based on Neve 8068 and secret secondary transformers), and AX7 tube saturation (dual 12AX7 triodes through Lundahl transformers). It includes mid-side processing, mix blending, high-boost EQ, the “X” button (a magic post-processing EQ curve with saturation), input/output gain staging with overload indication, 2x oversampling, and a skeuomorphic hardware-inspired interface. Designed for mixing engineers and producers seeking authentic analog coloration without compromise, it addresses the need for a genuinely analog-sounding saturator built from the ground up rather than adapted from other designs.

Key Takeaway

Furnace is that rare plugin that sounds and operates like hardware because it was designed by someone who uses hardware for a living, then coded by someone who understands analog circuit modeling deeply. It is the antidote to oversimplified saturators and parameter-bloated alternatives—essential for any mix engineer who wants to add cohesive, character-rich saturation that doesn’t feel like a digital compromise.

The Origin Story That Actually Matters

Sean Feder, a working mixing engineer with years of studio experience, didn’t approach a plugin company with a “slap my name on it” deal. He spent two years approaching developers with ideas, realized most weren’t willing to build exactly what he wanted, then found Vic from Phaserone—someone equally interested in creating something specific rather than chasing market trends. This history matters because Furnace is built by people who use saturation daily, for real work, not by committee consensus.

Three Flavors of Color, One Philosophy

The plugin offers three distinct saturation algorithms, each derived from real hardware:

The 456: Tape emulation based on a genuine half-inch tape mastering machine with 456 tape. It adds warmth, bottom-end weight, and a subtle fuzz that tape compression brings—without being destructive. Sean demonstrates it’s forgiving; even at high drive settings, it won’t “completely pop off and go nuts.” The saturation colors the tone rather than breaks it.

The TFM (Transformer): Built on Neve 8068 transformers, then cascaded through a second pair Sean won’t reveal. This is the “Swiss Army knife” of the three—thick, warm, and usable on almost anything. It adds depth to drum kits, fattens bass without destroying clarity, and thickens guitars while keeping them articulate. The transformer color box philosophy is evident in every demo: it changes tone before it adds obvious saturation.

The AX7 (Tube): Dual 12AX7 triodes into Lundahl transformers. This is the most musical and the most character-forward. Used subtly on parallel drums or stereo buses, it rounds off transients and adds fatness. Pushed hard on individual sources, it delivers genuine tube warmth.

The genius is that all three require input drive to unlock their character, just like hardware. Leave the input knob at noon with no extreme drive, and you get pleasant tape/transformer/tube coloration. Push the input into the red (indicated by an overload LED, like real hardware), and the saturation intensifies. This mirrors how analog gear actually works.

The Interface: Hardware Philosophy Made Visible

Furnace’s design is unapologetically skeuomorphic—it looks like a weathered project box with analog meters, physical knobs, and indicator lights. Sean is explicit: he likes this aesthetic, and the design emerges from the idea that operating it should feel like operating hardware.

The controls are minimal and purposeful:

Input & Output Meters: VU meters showing input and output at all times. You can see exactly how much level you’re pushing in and what comes out—transparency that most plugins hide in tiny waveform displays.

Drive: Controls saturation intensity. Higher = more character, more aggression.

Mid-Side Control: Sean emphasizes this is essential for his mixing work. Push saturation only into the center, only into the sides, or split it between them. This enables fine-tuning without needing three separate instances.

Mix Blend: Not always at 100%. Especially with mid-side engaged, dialing it back gives you proportional color instead of full effect.

High Boost: A simple shelf. Useful on individual instruments; Sean warns against it on stereo buses. It’s there when you need it, invisible when you don’t.

Shift+Input Gain Matching: Hold shift and push input up, output pulls down automatically. Gain compensation happens in real time, keeping level constant while saturation increases. Professional mixing workflow built in.

The X Button: A post-processing secret weapon. It’s an EQ curve (low-end boost, low-mid scoop, high shelf with width) plus a touch of saturation, applied after everything else. Sean demonstrates it on acoustic guitar—it’s subtle but transformative on individual sources. Not designed for buses; for surgical individual-track enhancement, it’s magic.

The Technology Under the Hood

Sean admits upfront: he can’t code. Vic handles the DSP using what he calls a “neural network inference engine with detailed circuit analysis and modeling.” It’s running in real time, not convolution or simple mathematical emulation.

This explains the sound. Furnace doesn’t approximate analog circuits; it models their actual behavior in real time. The result is uncanny—listening to the demos, it’s genuinely difficult to tell if you’re hearing processed audio or a hardware chain.

The Honesty Clause

Sean’s framing of this plugin is refreshingly self-aware. He says: “This is not a review. I can’t give it a star rating. It’s my own product.” He also commits to integrity: if a better saturator comes out, he’ll say so publicly, and he and Vic will iterate to beat it. This sets expectations—you’re buying from someone with credibility on the line, not a marketing department.

What Furnace Demands And Delivers

Unlike one-knob simplified plugins, Furnace requires engagement. You’re not “set and forget”; you’re actually mixing with it—adjusting input, drive, mix, mid-side balance—just like you would with hardware. Sean demonstrates this repeatedly: there’s no single “correct” setting; the plugin responds to your work and demands you pay attention.

This is intentional. The plugin is designed to reward experimentation and punish laziness. That’s also why it sounds so good—you’re actually using it, not just dropping it on a track and moving on.

CPU And System Integration

The neural network inference runs in real time with 2x oversampling. Sean doesn’t specify CPU overhead, but the demos show it handling full mixes without stuttering. The plugin offers no iLok, no internet validation—it installs and works. The demo is a full 14 days with no artificial limitations, no watermarks.

Format support is comprehensive: Mac/PC, AU, AAX, VST3. All certified and working. This is non-negotiable for a professional tool, and Furnace doesn’t compromise.

Saturation As Craft, Not Effect

The recurring demo theme is that Furnace doesn’t “add saturation”—it changes the tone of whatever you feed it. The tape version adds welly in the bottom; the tube version sometimes reduces bottom end; the transformer sits somewhere musical in between. This is color-box philosophy: saturation isn’t decoration, it’s tone-shaping.

Sean demonstrates this across drums, bass, guitars, and stereo mixes. Each application sounds like the saturation is serving the source, not fighting it. That’s expertise, not accident.

Pros	Cons
Three genuinely distinct saturation algorithms, each modeling real hardware.	Requires active engagement; not a “load and forget” plugin. Demands you mix with it.
Hardware-like operation: input drive to overload, gain matching, real VU metering.	Skeuomorphic interface not for everyone; some prefer minimal/modern UI design.
Mid-side processing enables surgical saturation without multiple instances.	No built-in presets mentioned; you’re starting from hardware defaults and tweaking.
The X button is a genuine secret weapon for individual instruments.	Best suited for engineers comfortable with analog workflow; learning curve steeper than simplified alternatives.
Affordable pricing ($59.99) for the level of analog modeling and circuit detail.	New company (first product); ecosystem and support unproven, though Sean commits to updates.
14-day full demo, no iLok, straightforward install and operation.	Probably not ideal on stereo buses; best used for individual tracks and selective applications.
Neural network circuit modeling delivers authentically analog sound quality.	Transformer and tube saturation personalities less versatile than tape for general use.

FAQs

Final Verdict

Furnace is a saturator built by someone who actually mixes records and coded by someone who understands analog circuit behavior. It sounds like hardware because it is modeling hardware—real tape machines, real transformers, real tubes—not digital approximations. The philosophy is explicit: you engage with the tool, you understand its character, you use it purposefully.

This won’t appeal to everyone. If you want simplified one-knob saturation or endless customization, look elsewhere. But for mixing engineers who want authentic, musically-useful coloration without compromise, Furnace is exceptional. The three saturation algorithms each bring distinct character; the mid-side processing enables finesse; the X button delivers unexpected magic on individual tracks.

Sean’s commitment to integrity—updating if something better comes along, maintaining the plugin properly—signals that this is a long-term product, not a cash grab. The pricing is fair; the demo is comprehensive; the interface is unapologetically hardware-inspired.

Furnace proves that a first product from a new company can be genuinely good when built by people who understand the problem intimately.

Rating: 4.6 / 5

Exceptional analog saturation modeling with three distinct, character-rich algorithms. Hardware-like operation and the X button magic weapon elevate it beyond typical saturators. Learning curve and lack of presets may repel casual users. For mixing engineers seeking authentic coloration and willing to engage actively, it’s unmatched in its category.