Creating Audio Files

Now you know it all works, you'll need to create your own audio files. The sound board does not support MP3 so if you have your audio clips in MP3 format you'll have to convert them to OGG or WAV

You can use either OGG or WAV format, and you can 'mix and match' so some files are OGG and some are WAV

There's some pro's and con's to the two formats:

  • OGG is compressed, but still sounds great. It uses much less space so if you want to say store a full 2 or 3 minute song, you'll need to go with this. However, it does take a few milliseconds to start playing the file, so if you want to have perfectly looping audio, OGG will have a gap in between each play through
  • WAV is uncompressed, so its the highest quality. But it takes up a lot of space. Since it's uncompressed, it starts playing instantly, and if you're looping an effect, this will have no discernable gap.

There's tons of software that can generate OGG or WAV, we used this service and it worked very nicely without needing to install any software: http://audio.online-convert.com/convert-to-ogg

If you don't mind installing software, Audacity can do a lot of conversion and is free software.

Generating audio files, especially if you want to keep them small, can take a little experimentation: higher bit rates and sample rates will sound 'better' but take more space. You can go with 44.1KHz sample rate which is basically audio CD quality, or down to maybe 8KHz for spoken word or low-rez effects.

Another way you can save space is to convert stereo files to mono. The decoder supports stereo but if you only have a single speaker it doesn't matter if you have stereo output and stereo takes 2x as much space!

Use 8 or 16 bit rates for WAV, 24-bit does not apparently work
Last updated on 2016-05-08 at 10.11.06 PM Published on 2014-09-23 at 06.09.39 PM