Q2: What bitrate must the MP3 file be?

A2: The module supports bit rates of 32 Kbps, 64 Kbps, 96 Kbps, 128 Kbps, 256 Kbps, and 320Kbps for MP3 files. Other bit rates for MP3 files could cause problems with playback.

Q3: What sampling rate must the .wav file be?

A3: The module supports sampling rates of 8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 or 48 KHz for .WAV files. Other sample rates for .WAV files could cause problems with playback.

Q4: My computer isn't recognizing the board when I plug it into my computer

A4: Some micro USB cords can only transport power through them, so it is important to make sure the cable can transfer both power and data. In other words, some cables are only good to charge devices, but cannot communicate with them. The first thing to do is test if the cable can not only charge but also communicate with other devices such as a phone, if not try a different cable.

Q5: The .wav file has an audible "click" when finished playing on the module. However, there is no "click" when I listen to the file on my computer.

A5: We converted the frequency of the files from 22.05KHz to 44.1kHz and the "click" disappeared. The "click" also disappeared when we converted the files from .wav to .mp3 format. 

Q6: The sound files that I put onto my device won't play when using a Mac to put the sounds onto the device. 

A6: Please see this link that a customer wrote up about a past sound module that they used and that they used the same information to get this version to work. Here Is a link to the article as well as the software that he mentions 

Article - https://appleause.com/2010/09/29/ultraprojector-and-mac/

App - https://macpaw.com/cleanmydrive