What "free" usually means in mixer software
Search for a free audio mixer for Windows and you mostly find two kinds of results: aging freeware that technically works but fights you at every step, and free editions of paid mixers where the routing you actually came for sits behind an upgrade button. Both leave you wondering whether the thing you are learning is the real product or a teaser for it.
A virtual audio mixer only earns its place if it does the whole job: give every sound source its own strip, let you route each source to exactly the destinations you choose, and clean up your mic on the way through. Patchd's free tier is designed to do all of that, not a slice of it. One thing to be upfront about before the tour: Patchd has not had its public launch, so everything below describes the free tier as it will ship. You can run it today in the open beta, which unlocks every feature while the beta runs.
Your sources: seven strips before you configure anything
The input side of the free mixer starts with five selectable strips: your microphone, and four virtual cables, each pulling one app, your music player, your game, your browser, onto its own strip. After them come two fixed strips, Desktop and Communications, which listen to two devices Patchd adds to Windows. Point Windows' default playback device at Patchd Desktop and your system audio lands on Desktop; point its default communication device at Patchd Communications and your chat apps land on Communications. Patchd's setup walks you through both. Every strip gets the same anatomy: a fader against a live meter, routing pills, mute and solo, its own effects rack, and Persona, the voice changer, at the bottom.
Where sound goes: three outs, six buses
Under every fader sits the block that makes this a mixer instead of a volume panel. The top group is your three hardware outputs: headphones, speakers, whatever you plug in. The bottom group is the six color-coded buses, each a virtual output other apps see as a microphone.
A source reaches a destination only when you light that pill, and nothing is lit until you light it. Mic lit on Bus 1 and game lit on Bus 2 means the stream gets each on a feed of its own. Music lit only on your headphones means the music never reaches the broadcast. Each lit route also has a level of its own: in the Matrix view, every lit route is a small fader where the source's row crosses the destination's column, so a source can sit loud in your headphones and lower on the stream.
The whole practical rack is free, plugins included
Click + Add Node on any strip and the full practical palette opens: all 13 practical nodes, from AI noise suppression and the noise gate through the compressor, parametric EQ, de-esser, expanders, and limiter. That is the entire mic-cleanup chain this site teaches, free. The same palette carries the VST Plugin entry, also free, which loads a VST3 effect you already own onto any strip. The 26 creative voice-effect nodes are the Studio half of the palette, added on top of the free half.
Any bus is a microphone
Here is the trick that ties the whole mixer together: every bus shows up in Windows as its own input device. Open the microphone picker in your calling or recording app, or add an Audio Input Capture in OBS, and Patchd Bus 1 sits in the list next to your real mic. Select it, and that app receives exactly what you routed to that bus, cleaned up, instead of a raw device.
That one idea covers most setups on this site: OBS capturing a bus per source, a recorder capturing clean desktop audio, a call app receiving your voice blended with any app. Patchd routes; your apps just see a very good microphone.
Honest latency, straight from the app
The free tier runs the same engine as the paid one. It locks onto the fastest audio path your device offers, ASIO first and WASAPI Exclusive otherwise, automatically, and reports the result in a read-only master clock readout: about 10.7 ms through the bus at a 512 buffer, lower with smaller ASIO buffers. There is no driver picker and no artificial delay penalty, and that is deliberate: the app locks the fastest path itself and shows you the number it achieved.
What Studio adds
Studio ($5.99 a month, $39.99 a year, or $119.99 once for a lifetime license) is the same mixer with Patchd's own creative tools on top. Every count above stays exactly where it is: five selectable inputs, three hardware outputs and six buses on both tiers. On the rack, Studio adds the 26 voice FX nodes, from autotune and vocoder to reverb and delay, on top of the 13 free ones. In Persona, Patchd's voice changer, Studio opens the full voice library, AI voices included, while free ships with 6 rotating taster voices. And Studio adds skins for the app itself.
Notice what is not on that list: inputs, outputs, buses, buses as microphones, VST3 hosting, meters, the mic-cleanup chain, and the low-latency engine. Those are the mixer, and they are free.
What you can build with the free tier on day one
A few concrete setups the free counts cover comfortably. A streaming setup: mic and game on strips, each on a bus of its own, your headphones carrying a private mix that includes the call your viewers never hear, and each bus added to OBS as its own source (the OBS walkthrough covers that handoff). A meeting setup: mic cleaned up with a gate, suppression, EQ, and a compressor, routed to a bus your calling app treats as a very good microphone. Or the trick of using any app as your microphone, which needs exactly one cable and one bus.
Where Patchd is today
Patchd has not launched publicly yet, but there IS something to download: the open beta hands you the build, with every feature unlocked while it runs. What you have read here is the launch scope of the free tier, stated plainly so you can decide now whether it fits your setup. If it does, you can run it today in the open beta.