[header] How to make an mp3 file [title] Download and install [http: // audacity. Sourceforge. Net audacity], an open-source audio editing program. [step] This program will be useful later for converting a raw audio source file into the mp3 file format. [title] Locate the microphone input for your computer. 
[step] Most laptops will have a microphone built into the system by default and locating it is just a matter of reading the manual. For desktop computers, however, it is unlikely that a microphone will be built into it.