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GSM to MTM - Online Audio Converter
Convert GSM to MTM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert GSM to MTM
Drop GSM audio here or click to select
GSM
MTM (MTM)
About GSM to MTM
Convert GSM to MTM. GSM 06.10 encodes European mobile speech at 13 kbps. MTM (MultiTracker) sequences 32-channel DOS-era compositions. Old 32-channel layouts may fold down; check the mix..
Why convert GSM to MTM?
- Tiny files with MTM note events (no audio samples).
- Keep quality where supported.
- Private, no upload - runs in your browser.
GSM vs MTM
| Codec | GSM | MTM |
|---|---|---|
| Compression | lossy | sequence |
| Sample behavior | Quality set by bitrate | Note events - no audio samples |
| Typical use | GSM 06.10 encodes European mobile speech at 13 kbps. | MTM (MultiTracker) sequences 32-channel DOS-era compositions. |
When not to convert GSM to MTM
- Skip MTM for recorded sound: it stores note events, not audio, so keep the GSM recording.
- Keep a master copy: repeated exports stack small losses, so archive GSM before batch MTM shares.
Limits
Starting point: GSM - GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration. Old 32-channel layouts may fold down; check the mix. Encode MTM (MTM) from GSM at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert GSM to MTM?
Drop your GSM file onto this page, choose quality and codec settings, then click Convert. The result downloads as MTM instantly. All processing runs in your browser.
What codec is used for MTM?
The default codec for MTM is MTM. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.