If you’ve ever tried to send your Mac’s audio to two outputs at once, you know the frustration. Apple’s built-in multi-output device feature works, sort of, until it doesn’t. Latency drifts, there’s no per-device EQ, and the whole setup feels like it was bolted on as an afterthought. That’s the gap Re-Q was built to fill.
Re-Q is a macOS menu bar app that sits between your Mac and every audio output you have connected. It intercepts your system audio and lets you route it to multiple devices simultaneously, each with its own fully independent effects chain. Parametric EQ, compressor, noise gate, reverb, de-esser, and 31 filters in total. All processed in real time.
What makes this interesting isn’t just the feature list. It’s the engineering behind it. Developer Keegan Wilgermein built Re-Q entirely in Rust, making direct calls to the CoreAudio HAL. Filters are precomputed. Memory is allocated per device at startup. The result is a pipeline that stays lean even with multiple outputs running at once, around 4% of a CPU core per device with no filters, rising to only 6-7% when you add three filters.
Key Features of Re-Q
Fully Parametric Equalizer with Unlimited Bands
Most system-level EQ tools give you a handful of fixed bands and call it a day. Re-Q gives you unlimited bands per device, with full control over gain, frequency, Q factor, slope, and mode. The visual curve editor makes it easy to see exactly what you’re doing to the signal. Low shelf, high shelf, peak, notch: it’s all there.
Multi-Output Routing with Per-Device Effect Chains
This is the core feature. Re-Q lets you send audio to as many connected devices as you want, all at once. More importantly, each output gets its own independent filter pipeline. Your studio monitors can have a flat EQ and a noise gate. Your headphones can have crossfeed, a compressor, and a de-esser. They don’t share anything.
Up to 64-Channel Support and Channel Remapping
For anyone working with multi-channel audio setups, Re-Q supports up to 64 channels and lets you remap any input channel to any output channel visually. The channel mapping interface is clean and direct: drag connections between driver channels and device channels, set your counts, and move on. It handles the kind of routing that usually requires dedicated hardware or expensive software.
A Library of 31 Real-Time Filters
Beyond EQ, Re-Q ships with an unusually wide set of processing tools. The list covers dynamics, spatial effects, modulation, and even creative effects:
- Dynamics: compressor, expander, noise gate, clipper, transient shaper
- Spatial: stereo width, crossfeed, Haas widener, pan, auto-pan
- Character: saturation, exciter, distortion, bit crusher, pitch shifter
- Time-based: reverb, delay, chorus, flanger, phaser, tremolo, vibrato
You can apply them in any order and rearrange the chain at any time. Filters are customisable per individual channel too, not just per device.
Designed to Stay Out of Your Way
Re-Q lives in the menu bar. Configure your routing, set your filters, close the window, and it keeps running quietly in the background. No dock icon cluttering things up. No interruptions. It just works until you need to change something.
How Marcus Fixed His Home Studio Setup at 11pm
Marcus Chen is a freelance music producer who works out of a spare bedroom in Auckland. His setup includes a pair of studio monitors connected via USB audio interface and a set of Sony WH-1000XM5 headphones he uses for late-night sessions when the monitors would wake everyone up. The problem: switching between them meant manually changing macOS output settings every time, and neither device sounded right without its own EQ curve applied. His monitors needed a low-shelf cut around 80Hz to compensate for the room. His headphones needed crossfeed and a mild high-frequency shelf boost.
At around 11pm on a Tuesday, Marcus installed Re-Q, added both devices as active outputs, and spent about fifteen minutes building out separate filter chains for each. Monitors got a parametric low-shelf filter and a compressor. Headphones got crossfeed enabled and a two-band EQ. He closed the window. Both outputs now played simultaneously with their own processing applied. When he wanted to work quietly, he just muted the monitors from the Re-Q interface and kept going. No profile switching, no re-opening any app. The configuration just stayed put, exactly the way he left it.
How Re-Q’s Signal Pipeline Actually Works
Step 1: Re-Q Becomes Your Audio Driver
After installation, Re-Q will ensure your Mac selects your chosen driver as it’s default output. It intercepts everything your Mac plays, regardless of which app produces it. Spotify, Final Cut, a browser tab: all of it passes through Re-Q first.
Step 2: You Add Output Devices and Build Filter Chains
Inside the app, you check the devices you want to receive audio. For each device, you open the filter library and drag effects into the active chain. Ordering matters: you can place a compressor before or after an EQ, and the result will differ. Rearranging is as simple as dragging blocks up or down.
Step 3: Filters Are Precomputed and Applied in Real Time
Once configured, Re-Q precomputes the filter math and processes audio with low CPU overhead. Changes you make to the EQ curve or any filter parameter are applied instantly. Close the window and the pipeline keeps running in the background until you quit the app.
Pricing: One Payment, No Subscription
Re-Q costs $35 as a one-time purchase. No monthly fee, no feature tiers, no account required. For a tool this capable at the system level, that’s a reasonable ask. There’s no free trial listed at the time of writing, so check the Re-Q website for the latest details before buying.
Who Should Try Re-Q
Re-Q is built for Mac users who care about audio quality and want actual control over where their sound goes and how it’s processed. Home studio producers, audiophiles with multiple listening setups, podcasters who want system-wide noise gating: all of them have a genuine use case here. If you’ve been tolerating macOS’s limited native audio routing, this is worth a serious look.
