Preparing Your Audio

To use an audio file in a Foxonix program, there is often some editing and processing that must be done. You'll want to trim down the beginning and end of the audio to remove any noise or dead space, increase or decrease the volume of the audio, and change the sampling rate of the audio to something that the sound chip can use. Luckily, this is all simple and easy to do, and there are many good audio editing programs out there.

If you have access to the Adobe suite of tools, then Adobe Audition is a great option. (That's what we use.)

Other, free options include WavePad and Audacity.


Any audio can be used in a Foxonix program, whether it's speech, music, or sound effects, as long as the file is in the proper format.
Audio files must:

  • Be in .wav format
  • Be mono files (not stereo)
  • Have a bit depth of 16 bits or less
  • Have a sampling rate between 2.5 kHz and 20 kHz


Refer to your own audio editor for help on how to address each of these points to get your audio into the proper format.

For most applications, we recommend using a sampling rate of 12 kHz. (Some audio editors only have an 11.025 kHz option, which is also fine.) The tradeoff with sampling rate is between audio quality and file size. A higher sampling rate will provide better quality audio, but the files are larger and take up more space in the flash memory.

The Internet is a treasure trove of sound files: songs, music loops, sound effects, movie quotes, drum beats, and instrument samples. While you can find pretty much anything you're looking for, please be respectful of the ownership and copyright of whatever you find and use.