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POST
/
tts
/
change-voice
Change Voice Speed
curl --request POST \
  --url https://api.example.com/tts/change-voice \
  --header 'Content-Type: application/json' \
  --data '
{
  "speed": 123,
  "api_key": "<string>"
}
'
Change the playback speed of an existing audio file without affecting pitch. Useful for creating faster or slower versions of audio content.

​
Request

​
audio
file
required
Audio file to modify (MP3, WAV, etc.)
​
speed
number
default:"1.0"
Playback speed multiplier. Range: 0.25 to 4.0
  • 0.25 = 4x slower
  • 1.0 = normal speed
  • 2.0 = 2x faster
  • 4.0 = 4x faster
​
api_key
string
Your GistMag API key (optional, but recommended for rate limiting)

​
Response

Returns the modified audio file as MP3.

​
Credit Cost

No credits charged - This is a free operation for adjusting playback speed.

​
Example Request

curl -X POST https://api.gistmag.co.uk/tts/change-voice \
  -F "audio=@speech.mp3" \
  -F "speed=1.5" \
  -F "api_key=your_api_key_here" \
  --output faster_speech.mp3

​
Use Cases

  • Create faster versions for time-constrained content
  • Slow down speech for better comprehension
  • Adjust speed for different audience preferences
  • Create variations of existing audio content