Linux Audio Recording Guide

Browser-Based DAW

Try our browser-based Digital Audio Workstation—zero install. It's running right here. More »

Multi-track recording and mixing directly in the browser. Built with the Web Audio API and modern JavaScript, it supports:

• Multi-track recording — record and layer audio tracks with individual volume and pan controls
• Waveform visualization — see your audio as you record and play back
• Master transport controls — play, pause, stop, reverse, and BPM-synced tempo
• Clip trimming — drag to select regions, trim silence, and arrange sections visually
• Keyboard shortcuts — Press F1 to speed up editing with keybindings for record, play, stop, and track management
• Browser-based noise reduction — real-time filtering without external plugins

Because it runs entirely in the browser, there is nothing to install. Just open the page and start recording. The DAW uses no server-side processing — all audio stays private on your machine. More about this widget.

Audio Recording

Whether you are cutting a podcast, laying down demo tracks, or producing a full album, Linux offers quality audio tools without licensing fees or subscription lock-in. The remainder of this guide walks through the entire workflow: choosing recording software, reducing noise, normalizing levels, trimming clips, editing with keyboard shortcuts, and mixing multiple tracks — all using free, open-source applications.

Professional recording hardware delivers the best results, but modern home PCs — even an old laptop, a Raspberry Pi, or an Arduino — can capture a surprising amount of fidelity with the right software. Built-in sound cards often suffer from noise and nonlinear A/D conversion, but a modest USB audio interface solves that for under $100.

Audacity

Audacity is the flagship open-source multi-track editor. It balances power with approachability: you can record a simple voice memo in seconds, yet its toolset handles professional session work. The built-in documentation covers every feature.

Newer versions of Audacity include AI-driven tools that simplify common tasks:

AI Noise Reduction* — learn a noise profile from silence, then apply spectral subtraction with a single click AI Clip Trimming — intelligently detect and remove silence, breaths, and mouth noises without manual selection Keyboard Shortcuts — Audacity supports customizable keybindings for nearly every operation. Common defaults include Space for play/pause, R for record, Ctrl+X to trim silence, and Shift+Z for zoom. You can remap any action under Edit > Preferences > Keyboard*. Effects chain — batch-process noise reduction, normalization, EQ, and compression in one pass

To get a noise profile: select a quiet section of audio, then go to Effects > Noise Reduction > Get Noise Profile. Select the entire track, reopen the effect, and click OK. For best results, adjust the sensitivity sliders per track — a single profile rarely suits every source.

SoX — The Swiss Army Knife of Audio

SoX processes audio from the command line, which makes it ideal for scripting and batch workflows. A basic recording:

rec out.wav

SoX also handles noise profiling and reduction in two passes:

sox out.wav -n trim 0 .9 noiseprof | play out.wav noisered - 0.2

This approach is fast but can introduce artifacts. An alternative is a noise gate using compand:

play out.wav compand .2,.2 -30.1,-inf,-30,-20 0 -90 .1

This attenuates everything below -30 dB and compresses the remaining signal into a 0–20 dB range with 200 ms attack/decay. A more refined multi-band gate:

play out.wav mcompand ".01,.2 -50.1,-inf,-30.1,-50" 100 \
".01,.2 -50.1,-inf,-30.1,-50,-30,-20" 1000 \
".01,.1 -70.1,-inf,-50.1,-70" 3000 \
".01,.1 -70.1,-inf,-40.1,-70"

Refer to the SoX documentation for additional parameters.

Quick Recordings with GStreamer

For quick captures, GStreamer pipelines work from the terminal. Save hard drive space with compressed Ogg Vorbis:

gst-launch -e autoaudiosrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=out.ogg

Or capture lossless FLAC for archival quality:

gst-launch -e autoaudiosrc ! audioconvert ! audio/x-raw-int,rate=44100,channels=1 ! flacenc ! filesink location=out.flac

Play back with the reversed pipeline:

filesrc location=out.ogg
 ! oggdemux ! vorbisdec ! audioconvert ! autoaudiosink

Any player — ffplay, mplayer, Totem — handles these formats. A codec pack may be needed for Windows Media Player.

Master Control — Visual GStreamer Pipelines

We built Master Control as a graphical interface for gst-launch. It provides drag-and-drop pipeline assembly with real-time feedback on plugins like the level meter, spectrum analyzer, noise reduction, pitch shifting, and EQ filters. You can tweak parameters live without editing command-line flags.

Removing Noise with PulseAudio

PulseAudio supports noise cancellation via the WebRTC audio processing module. Install the webrtc-audio-processing package through your system package manager (Apper or yum on Fedora), then append the following to /etc/pulse/default.pa (or ~/.pulse/default.pa for a per-user configuration):

### Load echo cancellation module
load-module module-echo-cancel source_name=echosource aec_method=webrtc
set-default-source echosource

Restart PulseAudio with pulseaudio -k.

Noise Gate via LADSPA

Master Control can apply a LADSPA noise gate to a live microphone stream. The ladspa-gate plugin is mono-only; for stereo sources, GStreamer's deinterleave and interleave elements split and recombine channels. Find available LADSPA plugins with:

gst-inspect |grep ladspa

A live noise gate preview (adjust Threshold to match your room):

autoaudiosrc ! audio/x-raw-float ! ladspa-gate Threshold=-30.0 \
Decay=2.0 Hold=2.0 Attack=0.1 ! queue ! audioconvert ! autoaudiosink

A pitch shifter for fun:

autoaudiosrc ! audio/x-raw-float ! ladspa-tap-pitch \
Rate-Shift----=-20 Wet-Level--dB-=20 ! queue ! audioconvert ! autoaudiosink

Master compressed audio with the noise gate applied:

autoaudiosrc ! audioconvert ! ladspa-gate Threshold=-30.0 \
Decay=2.0 Hold=2.0 Attack=0.1 ! vorbisenc ! oggmux ! filesink \
location=out.ogg

Or master lossless FLAC for maximum quality:

autoaudiosrc ! ladspa-gate Threshold=-30.0 Decay=2.0 \
Hold=2.0 Attack=0.1 ! audioconvert ! \
audio/x-raw-int,rate=44100,channels=1 ! flacenc ! filesink \
location=out.flac

Editing in Audacity

Audacity's editing and filtering tools let you shape each track precisely. Common editing tasks can be automated to speed up repetitive work.

The typical noise-reduction workflow: record or select silence, grab a noise profile via Effects > Noise Removal > Get Noise Profile, then apply to the full track. The default settings are rarely optimal — adjust the sliders and preview until the artifacts are acceptable. We salvaged a particularly noisy microphone with the settings shown below.

Keyboard Shortcuts for Faster Editing

Audacity's keyboard shortcuts turn slow mouse work into fluid editing. Key defaults every producer should know:

* Space — Play / Stop * R — Start / Stop recording * Shift + R — Record on the current track * Ctrl + X — Trim selected audio (delete all but the selection) * Ctrl + K — Split cut (remove selection, leave gap) * Ctrl + I — Split at cursor position * Ctrl + J — Join adjacent clips * Ctrl + L — Silence the selection (replaces with silence) * Shift + Z — Zoom to selection * Ctrl + 1 / 2 — Zoom in / out * Delete / Backspace — Delete selected audio and close gap

All shortcuts are configurable under Edit > Preferences > Keyboard.

Normalize Sound Levels

Tracks that are too quiet invite noise floor issues; tracks that are too loud clip and distort. Normalization brings the peak level to a target (usually -1 dB or -3 dB) so your production sits consistently with commercial releases. Most editors — Audacity, SoX, our DAW — offer a normalize function. SoX:

sox in.wav out.wav norm -3

Transients can skew automatic results. A final level adjustment by ear always beats a blind normalization.

Recording Multiple Tracks

Overdubbing and mixing tracks lets you layer vocals over instruments, create harmonies, or insert narration into a pre-recorded backing track. It is the same technique that enables "singing along with yourself."

If your overdubs drift out of sync, perform a latency test. We measured 157 ms on one system and compensated by shifting tracks in the timeline.

Once the arrangement sounds right, export a mixdown to a lossless format — WAV or FLAC — for archival and further mastering.

System-Wide EQ with PulseAudio

Install pulseaudio-equalizer-gtk on Fedora via yum or Apper. No launcher icon is created by default; save the following as a .desktop file:

[Desktop Entry]
Comment=
Exec=/usr/bin/pulseaudio-equalizer-gtk
GenericName=Pulseaudio EQ
Icon=view-media-equalizer
Name=Pulseaudio EQ
NoDisplay=false
Path[$e]=
StartupNotify=true
Terminal=0
TerminalOptions=
Type=Application
X-KDE-SubstituteUID=false
X-KDE-Username=

Getting to Know JACK

Anyone who knows Jack about audio probably does not need this section. For everyone else: JACK is a low-latency audio server that routes audio and MIDI between applications. To play a software synth from an external MIDI keyboard:

1. Start QJackCtl 2. Launch FluidSynth GUI 3. Configure FluidSynth to use JACK routing 4. Connect a MIDI keyboard (or use a software keyboard) 5. Use QJackCtl's connection graph to wire the keyboard output to the synth input

JACK's learning curve is real, but the payoff is sub-10 ms latency for live performance.

Audio Links

Audacity Support

Swap left and right audio channels

GStreamer Cheat Sheet

Comparison of container formats

Raspberry Pi

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