The $0 Voice Upgrade Challenge: Up Your Game For Free!

For me, every day is a battle against GAS (Gear Acquisition Syndrome). If there is a shiny new microphone or a “game-changing” plugin bundle, my credit card usually starts sweating before I’ve even finished reading the marketing copy, usually right before it reminds me that I don’t have that kind of cash just lying around.

But here’s the thing–you don’t actually need to spend a fortune to sound better than 90% of your colleagues on Zoom.

In fact, the single biggest upgrade you can make isn’t hardware. It’s signal processing. So, I’m issuing a challenge: can we build a broadcast-ready vocal chain using zero new hardware and strictly free software?

Yes. Yes, we can. (And we’re going to do it without installing sketchy warez from 2005).

The Rules of Engagement

Existing Hardware Only: You have to use what you have. Laptop mic? Fine. Old dusty USB headset? Great. That webcam mic you swore you’d never use? Let’s see what it can do (side note: some webcams have shockingly good mics!).

$0 Budget: If it asks for a credit card, it’s out.

Real-Time Ready: This isn’t for post-production. This has to work live on Zoom, Teams, or Slack.

Phase 1: The “Shopping” List

We need to download a few things. Don’t worry, I’ve curated this list to avoid the CPU-hogging nightmares.

1. The Host (Your Virtual Rack)

You need a piece of software to hold the plugins. Think of this as your virtual equipment rack.

Windows: Equalizer APO + Peace GUI .

Why: It runs at the system level. You set it once, and it just “fixes” your mic driver globally. It’s lighter than air.

macOS: Hosting AU (or GarageBand if you must).

Why: Hosting AU is a tiny micro-host that does one thing and does it well. It won’t turn your MacBook into a jet engine.

Alternatives (Check Your Hard Drive First)

I listed the lightweight options above because they are purpose-built for this, but let’s be real: if you’re a gamer or a closet musician, you might already have a perfectly good host installed.

OBS Studio (Windows/Mac): If you stream or record videos, you probably have OBS. It supports VST plugins natively on your microphone source! You just need to set your Monitoring device to your virtual cable (BlackHole) to get the audio out to Zoom.

A Full DAW (Digital Audio Workstation): Do you dabble in music production? Any DAW can do this.

Mac Users: You already have GarageBand. It works great as a live processor if you turn on “Input Monitoring.”

Windows Users: Cakewalk by BandLab is completely free and powerful (honestly, it’s overkill for voice, but it works).

Reaper: The “unlimited trial” legend. It’s incredibly efficient and flexible if you have it installed.

Bitwig Studio: My weapon of choice. It comes with a 30-day trial, and after that, it will continue to work; you just can’t save your project.

The Golden Rule: The best tool is the one you already know how to use. If you’re comfortable routing audio in OBS, just use that! We aren’t looking for style points here; we’re looking for clean audio.

2. The Routing (The “Invisible Wire”)

This is the part that confuses everyone, so stick with me.

When you run your microphone through a host app (like Hosting AU or a DAW), the audio doesn’t automatically go to Zoom. It stays stuck inside the host app. We need a way to pipe that processed audio out of the host and into your meeting software.

Think of this software as a virtual patch cable. You plug one end into the “Output” of your host, and the other end into the “Input” of Zoom.

For Windows Users

The “Magic” Method (Equalizer APO): If you are using Equalizer APO as recommended above, you do not need a virtual cable. It hooks directly into the Windows audio driver. You can skip this entire section. Go grab a coffee.

The “DAW” Method (VB-Cable): If you decided to use a DAW (like Reaper or Cakewalk) or some other plugin host instead of Equalizer APO, you will need a cable.

Get this: VB-Audio VB-Cable . It’s the classic standard. It adds a playback device called “CABLE Input” and a recording device called “CABLE Output.”

(Nerd Note: You might hear people suggest VoiceMeeter. While VoiceMeeter is neat, it is essentially an imaginary mixing console with 4,000 buttons. For this specific project, it is massive overkill. Stick to the simple VB-Cable.)

For macOS Users

Macs don’t handle internal audio routing natively, so we need a helper.

The Standard: BlackHole (2ch) .

Why: It’s open-source, lightweight, and rock solid. It simply creates a new audio device that passes audio from one app to another.

The User-Friendly Alternative: GroundControl Cube .

Why: If BlackHole feels too “developer-y” for you, Cube is a free alternative that has a nice little menu bar interface to control volume. It also offers monitoring, which is a HUGE bonus.

The “I Have Money” Option: Loopback by Rogue Amoeba.

Why: Okay, this breaks the “$0” rule of this post. But I have to mention it because it is the gold standard . If you eventually decide to do this professionally and use macOS, just buy Loopback. But for today? Stick to BlackHole.

The Danger Zone (Read This!)

When you set this up, you must be careful about your Monitoring Output.

DO: Send your Host App’s output to the Virtual Cable.

DO NOT: Send your System Output (Speakers/Headphones) to the Virtual Cable.

If you mess this up, you will create a feedback loop. This is where the audio goes out, comes back in, gets amplified, goes out again, and results in a screeching noise that will make your dog hate you forever. Consider yourself warned.

3. The Plugins (The Secret Sauce)

This is where the audio nerdery happens. Grab these:

Noise Suppression: Bertom Denoiser Classic

Why: It’s “Pay What You Want” (free is allowed), zero-latency, and frankly, it beats a lot of paid plugins I own. There’s a paid pro version available, as well.

The Utility Belt: Kilohearts Essentials

Why: Download the installer and just grab the free “Essentials” bundle. You get a Gate, Compressor, and Limiter that are clean, modern, and easy to read.

EQ: TDR Nova

Why: It has a live frequency analyzer. This means you can actually see the ugly frequencies we’re about to cut. It also brings along a whole host of useful features you can grow into, to do things like remove excessive sibilants (“ess” sounds).

Honorable mention: MeldaProduction MFreeFXBundle

Why: It offers a wide selection of high-quality tools to up your game even more. The Melda UI is really ugly, but effective, and all of their tools are surprisingly deep.

Phase 2: The Chain (Physics Matters!)

Now, load your plugins into your host. Order is critical here. If you put your compressor before your denoiser, you’re just going to make the background noise louder (and we definitely don’t want that).

The parameters suggested here are broad guidelines. As you adjust parameters, try to listen to what is changing in your sound, and tailor it to your specific needs.

Slot 1: Noise Suppression (Bertom Denoiser)

The Goal: Kill the AC unit and that laptop fan that sounds like a helicopter.

The Move: Adjust the Threshold slider until the background noise just barely disappears when you stop talking.

Audio Nerd Tip: Don’t be greedy! If you push this too hard, you’ll sound like a robot underwater (or a low-bitrate MP3 from 1999). 10dB of clean reduction is better than 20dB of artifacts.

Slot 2: The Gate (Kilohearts Gate)

The Goal: Total silence when you aren’t speaking.

The Move: Set the Threshold just above the “floor” of your background noise.

The Move: Set the Release to be slow—around 200ms to 400ms. If it’s too fast, it will chop off the ends of your sentences (and you’ll sound like you’re having connection issues).

Audio Nerd Tip: Use the Kilohearts Dynamics plugin as an expander, instead! This is more advanced, and trades a more natural sound for a very slightly more complicated setup.

Drag the dot in the lower-right corner of the visualization to the right, to around 1:6, 1:8, or somewhere in that region (experiment. It’s fun!). Congrats, you now have an expander!

The Threshold control isn’t as obvious here. It’s the vertical line on the left, with the little flag-looking triangle at the top. Drag it left and right to change the threshold.

Slot 3: Equalizer (TDR Nova)

The Goal: Fix the “cheap mic” physics.

High Pass Filter (HPF): Activate this band and drag it to 80Hz. This kills “desk rumble” and low-end mud.

The “Boxy” Cut: Drag a bell curve to around 300Hz-400Hz and pull it down about -3dB. This removes that “I’m talking inside a cardboard box” sound that plagues almost all laptop mics and webcams.

The “Air” Boost: Drag a high shelf to 8kHz and boost it gently (+2dB). This adds that expensive “shimmer” and clarity.

Slot 4: Compressor (Kilohearts Compressor)

The Goal: Consistency. We want your whispers and your laughs to be roughly the same volume.

Ratio: Set to 4:1.

Threshold: Lower this until you see the gain reduction meter bouncing just a little bit when you speak normally.

Makeup Gain: Turn this up to bring your overall volume back to a healthy level. (Just don’t clip the output, please).

Phase 3: The Setup

If you are on Windows…

Install Equalizer APO and select your capture device (your mic) in the Configurator. Reboot.

Open Peace GUI.

Click the little + button to add plugins. Point it to the VST files (.dll) you installed.

Done. It’s system-wide. You are now a broadcast god in every app.

If you are on macOS…

Open Hosting AU.

Input: Select your physical mic (e.g., “MacBook Pro Microphone”).

Output: Select BlackHole 2ch.

Load your plugins in the rack slots.

Open Zoom/Teams.

Microphone Input: Select BlackHole 2ch.

Warning: Do NOT select BlackHole as your Speaker output in Zoom. If you do, you will create a feedback loop that will destroy your ears and possibly your soul.

The Verdict

Record a quick “Before” and “After” clip. The difference should be shocking. You have effectively taken a $0 hardware setup and applied the same signal processing principles used in pro studios.

Is it as good as a Shure SM7B running through a Neve preamp? No. Is it better than your coworker who is using their raw webcam mic in an echoey kitchen? Absolutely.

The Good

It costs literally nothing

Teaches you the fundamentals of signal flow

Works with the gear you already have

The Bad

Requires some initial setup time

On Mac, you have to keep the host app open

Won’t fix a truly terrible room (physics always wins)

Welcome to the rabbit hole :)

If you survived this challenge and you’re bitten by the bug, the next step isn’t a $400 mic—it’s a $50 mic arm to get the mic closer to your face. But that’s a post for another day. Have you tried this $0 chain? Let me know how much clearer your meetings are!