Audio File Format

These instructions are assuming you are using Audacity. If you are not, I recommend you switch. Audacity is a free, open source audio editing tool that is available for download here. The audio file has to be in a 22050Hz format. This can be accomplished by selecting the Project Rate (Hz) tab on the bottom left hand of the screen and selecting 22050 from the drop down menu. That's it! Your audio is now ready for PiFm broadcasting.