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Reverse Audio at Scale: A Debugging Playbook for Engineers Who Hate Surprise Sibilance

Picture the bug report: a track plays fine in the mix bus, but the moment it runs backwards, the vocalist sounds like a kettle whistle. The waveform…

Fixing Low USB-C Audio on Fedora Linux: My Battle with the Razer Leviathan

TL;DR: If you have a Razer Leviathan connected via USB-C on Linux and the volume is incredibly quiet even at 100%, PipeWire is likely crushing your…

Supplier Invoice Speech-to-Text: EU Startup Validation Beyond Per-Minute Pricing

Short answer: the cheapest speech-to-text API for an EU startup is the candidate that passes your invoice-field accuracy gate at the lowest normaliz…

How I record system audio on macOS without a virtual driver

Recording your own microphone on a Mac is a solved problem. Recording the other person — the voice coming out of your speakers — is where macOS quie…

One Ring to Rule Them All: Wiring Radios to Laptops the Hard Way

Multi-Voice Audiobooks: The Character Attribution Problem

Turning a novel into a multi-voice audiobook sounds like a TTS problem. It is mostly a parsing problem, and the parsing is harder than the synthesis…

Going Below Android's Volume Floor: DynamicsProcessing, LoudnessEnhancer, and Reproducible F-Droid Builds

Android's volume slider has a floor, and on a lot of devices that floor is louder than it should be. The first step above mute is a fixed fraction o…

Can YAMNet Detect Unseen Sudden Sounds in Real Time? A 48-Stream Evaluation

Hello, everyone. There are many situations where we may want to monitor sounds that happen without warning, such as breaking glass or a car horn. Re…

Transcribe Audio to Text Like a Developer: From File to Final Text

You've got a two-hour architecture review sitting in your Downloads folder. Last month, mine was a 94-minute mess where three engineers talked over…

How to Transcribe Audio to Text: A Practical Workflow for Developers

You've got a 45-minute meeting recording sitting on your desktop. Maybe it's a podcast raw file, or an interview you did for a project. You need it…

Half-Time vs Double-Time BPM Detection: How We Fixed Spotify's Known Accuracy Gap

Run Blinding Lights by The Weeknd through Essentia's RhythmExtractor2013 . It returns 85.4 BPM. The track is famously 171 BPM — one of the most-play…

Build a Voice Assistant with Python and Whisper

Build a Voice Assistant with Python and Whisper Imagine hearing your computer whisper back a response to your question, not through a robotic script…

Computer Science Off Course - Programming as Theory Building

FFmpeg dynaudnorm Filter: Dynamic Audio Normalization Guide

Originally published at ffmpeg-micro.com You're editing together clips from three different recording sessions, and every cut brings a jarring volum…

Keygen Church - Oscuro Domine

Emotions on a cloned voice: a 25 MB graft, a steering vector, and a lot of dead ends

Part of qwen3-tts — a pure C inference engine for Qwen3-TTS. TL;DR Qwen3-TTS ships 9 neutral preset speakers. No emotion control, and cloning a voic…

Stegachirp: Hide Messages in Audio Files Using Pure Python (No NumPy, No SciPy)

Hide a Message in a WAV File With Pure Python (No NumPy, No FFT) I built stegachirp because I wanted to send a short secret message inside an audio…

Tagging Environmental Sounds with YAMNet TFLite: An ESC-50 Evaluation over 2,000 Clips

Hello, everyone. Today is Tanabata in Japan. Events like Tanabata, summer dance festivals, and Christmas all seem to have their own sound images. Th…

Classifying Environmental Sounds with CLAP and ONNX Runtime: A 1-NN Evaluation on ESC-50

Hello, everyone. When people hear an animal call or keyboard typing, they can infer something about the source and setting. If we turn those sounds…

Detecting Speaker Changes with Pyannote Segmentation 3.0 and ONNX Runtime

Hello, everyone. When listening to a conversation, we naturally keep track of who is speaking. A program has a harder job: beyond finding speech, it…

Extracting Speech Segments with Silero VAD and ONNX Runtime

Hello, everyone. Have you ever wanted to keep only the parts of a recording where someone is speaking? Finding silence before transcription can redu…

Voice cloning models, measured across five languages

I benchmarked local voice-cloning models across English, German, Modern Standard Arabic, Spanish, and Mandarin Chinese. Models: OmniVoice int8 Chatt…

I built a VAD that beats Silero, Pyannote, and WebRTC on noisy audio — here's how

I built NOVA-VAD — a lightweight, explainable Voice Activity Detector that beats every major open source VAD on real-world noisy audio. GitHub:( htt…

macOS Still Has No Volume Mixer, So I Built One

macOS has never had a proper per-app volume mixer. On Windows, this is basic. You can lower Spotify, mute a browser, keep a meeting app loud, and le…

Qtractor Usage Bible - Volume 1

QTRACTOR BIBLE Volume 1 — Foundations PART I — QTRACTOR CONCEPTS & WORKFLOW MODEL Chapter 1 — What Qtractor Is Quick Start Qtractor is a non-des…

Qtractor Usage Bible - Summary

Qtractor is a lightweight Linux DAW (Digital Audio Workstation) for audio and MIDI recording. Organization This bible series is organized in a workf…

One mp3, twelve panels.

Phase two of Reel shipped on Monday. A reader page can now play a voiced narration of the comic while the panels turn. The piece I want to write dow…

Qtractor Complete Guide

Complete First-Time Setup Guide for Qtractor on Ubuntu 26.04 install and prepare the system verify audio works configure PipeWire/JACK configure Qtr…

Clean Audio Before Whisper: How Noise Removal Improves Transcription Accuracy (With Code)

Whisper is remarkably robust. But "robust" doesn't mean "immune to noise." If you've ever run a meeting recording through Whisper and gotten back ga…

Server-Side WebRTC Noise Reduction with Pion, FFmpeg, and RNN Models

This is a sanitized engineering note about server-side audio noise reduction for WebRTC calls. Source article: https://www.lodan.me/posts/server-sid…