If you would like a different set of phrases, this is possible with a bit of work.
You have twenty six files labelled A to Z and 6 keys after that numbered 01 to 06 for a total of 32 keys.
The following guide page goes over recording speech files:
You can also make sound files for a general soundboard. The Adafruit Learning System has tutorials for several NeoTrellis M4 Express soundboards.
The sound files you record or find on the Internet must most likely be converted to a format easier for the NeoTrellis microcontroller to use. The format is WAV files, PCM 16-bit, a maximum of 22,050 Hz and mono (one channel). To convert sound files for use, we suggest following this Adafruit tutorial:
If you make your own files, you should check to see which subdirectory to use. You can use the existing /animals or /electronics subdirectories. Or you can make your own subdirectory and change the value of
SAMPLE_FOLDER in the code to your chosen subdirectory. Be sure there is a forward slash ("/") in front of and at the end of the filename, for example
SAMPLE_FOLDER = "/myfolder/".