MTM to HE-AAC - Online Audio Converter
Convert MTM to HE-AAC online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About MTM to HE-AAC
Convert MTM to HE-AAC. MTM (MultiTracker) sequences 32-channel DOS-era compositions. HE-AAC adds spectral band replication for efficient low-bitrate streaming. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth..
Why convert MTM to HE-AAC?
- Smaller files with HE-AAC lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
MTM vs HE-AAC
| Codec | MTM | AAC (HE) |
|---|---|---|
| Compression | sequence | lossy |
| Sample behavior | Note events - no audio samples | Quality set by bitrate |
| Typical use | MTM (MultiTracker) sequences 32-channel DOS-era compositions. | HE-AAC adds spectral band replication for efficient low-bitrate streaming. |
When not to convert MTM to HE-AAC
- Skip HE-AAC for archival masters: lossy compression discards detail, so keep the MTM original.
- Keep a master copy: repeated exports stack small losses, so archive MTM before batch HE-AAC shares.
Limits
Starting point: MTM - MTM (MultiTracker) sequences 32-channel DOS-era compositions. Old 32-channel layouts may fold down; check the mix. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth. Encode HE-AAC (AAC (HE)) from MTM 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.