How Pitch-Preserving Speed Change Works
Convertio uses the WSOLA (Waveform Similarity Overlap-Add) algorithm — the same time-stretching method used by professional DAWs and media players. Unlike simple fast-forward that makes voices sound like chipmunks, WSOLA separates tempo from pitch.
The algorithm divides audio into overlapping segments, then repositions and crossfades them to create natural-sounding speed changes. The result: your audio plays faster or slower while voices and instruments maintain their original pitch and character.
Quality is best within the 0.5x–2.0x range. For extreme changes beyond 2x, samples may be skipped rather than blended. For most use cases — game audio modding, recording adjustments, content creation — the standard range delivers transparent results.
Speed Settings Guide
| Speed | Duration Change | Best For |
|---|---|---|
| 0.5x | 2× longer | Learning complex musical passages, detailed transcription |
| 0.75x | 33% longer | Slow-motion game cinematics, language learning |
| 1.0x | Original | Default — no tempo change applied |
| 1.25x | 20% shorter | Comfortable speedup for podcasts, lectures |
| 1.5x | 33% shorter | Intensified action sequences, fast gameplay montages |
| 2.0x | 50% shorter | Quick content review, time-lapse audio effects |
OGG Speed Change: Game Audio and Beyond
OGG Vorbis became the de facto audio format in gaming because it was royalty-free when MP3 was still patented. Games like Unreal Tournament, Half-Life 2, and countless indie titles ship their soundtracks and effects as OGG files.
Modders and content creators often need to adjust game audio tempo — slowing down a dramatic soundtrack for a cinematic video, speeding up ambient sound for a time-lapse, or matching audio timing to edited gameplay footage. Converting to MP3 ensures the result works in any video editor or media player.
Linux users frequently encounter OGG files since many open-source applications default to the format. Speed-adjusting and converting to MP3 makes the audio universally compatible.
For game audio modding: try 0.75x to create a slow-motion effect, or 1.5x for an intense action sequence. The converted MP3 works in any game engine or editor.