They can be of the format(s): RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz
So of format RIFF or WAVE/PCM at 16bit, mono with 8khz sampling rate.
Use the free Audacity audio editing tool to create the files.
When you export an audio file with this program, you can save the output as "WAV (Microsoft) signed 16 bit PCM

Test Bell Volume

Log into the Cyberdata Bells system: https://www.cyberdata.net/pages/user-uploadable-bells
Go to the Audio Files button at the top
Scroll all the way to the bottom. There will be a Bells bold heading in the lower left
Underneath Bells you can click "Play" next to the .wav file listed. This will play the tone out to the PA Zones 2 and 3. You can then tweak the volume on MIC 1 for the Zones 2 and 3 amps. Tweak it very slowly as moving it just a millimeter will adjust the volume noticeably.

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