A clean, editable copy
WAV is the most universal audio format, and turning MMF into WAV gives you a file that every editor, sampler and player understands. Musicians use old phone sounds as samples for a retro, lo-fi character. Collectors archive their ringtones. Others want to clean up a voice tone recorded by a friend long ago. In each case, converting MMF to WAV is a good first step, because a WAV can be edited and saved repeatedly without new compression loss.
What gets decoded
The converter reads the recorded audio in the SMAF file, usually Yamaha ADPCM. Files that contain only synthesizer note data, as many polyphonic melody tones do, have no recording inside and cannot be converted here. Mixed files give you the recorded part only.
Settings
| Setting | Recommendation | Why |
|---|---|---|
| Bit depth | 16-bit | The source has only 4 bits of detail per sample |
| Channels | Mono | MMF audio is mono |
| Sample rate | Original, or 44.1 kHz | Original for archiving, 44.1 kHz for editing projects |
Even at 44.1 kHz, the WAV stays small for typical ringtone lengths: a 30-second mono tone is about 2.6 MB. At the original 8 kHz, it is under 0.5 MB.
About resampling
Choosing 44.1 kHz does not add the missing high frequencies; it only stores the same narrow-band sound at a common rate. Some editors and samplers handle odd rates such as 8000 or 11025 Hz poorly, so the higher rate is mainly about compatibility.
Using the WAV
Open the file in the audio editor to trim silence, add fades or join several tones. To use an old tone as a lo-fi sample, try Pitch Shifter or Reverb for new textures. When you want a modern ringtone again, WAV to M4R makes an iPhone tone of up to 40 seconds. MMF files almost never contain a title, so name the WAV clearly before you save it.