To build Audacity yourself, download the source code. Although there are a number of sellers of Audacity software on ebay, Amazon, Microsoft Store and Apple Store, none of these sellers are affiliated to Audacity, and none have contributed in any way to the Audacity project. Source code and user manuals for some old versions are available on FossHub, as well as AppImages since version 3.0.3. For Linux, the appropriate version of Audacity for your operating system is usually included in your distribution’s repository. For macOS 10.12 (Sierra) and earlier, legacy versions of Audacity are available on the Legacy Mac downloads page. 
For Windows 7 and earlier, legacy versions of Audacity are available on the Legacy Windows downloads page. They cannot turn a bad recording into gold.īefore applying any treatment to the audio file, export the raw recording as a *.WAV file to an external storage space. It is always best to start with the best recording available to you. In addition to the ACX_Check Analyzer, you can check an mp3 file of your audio to see if it meet the guidelines by going to and submitting a sample. The noise floor in the recording cannot be louder than -60dB. A plane overhead traffic right outside the hum of an appliance all contribute to a noisy environment. This is an average of the background noise in the recording environment. The last item in the ACX_Check is the Noise Floor. 
The smaller the file, the fewer data points to measure. The average is for the file being tested. The average RMS (loudness) required by ACX must measure between -23dB and -18dB. RMS is an acronym meaning "root mean square." No, there is no need to recall your favorite math book.
As you record, make sure your peak volume as measured by the software, is under -3dB. Talk as if you are talking to one person. This does not mean monotone - who wants to listen to that. You should be about a fist distance away from the microphone and speak in a consistent tone. The Peak level is the maximum loudness and it needs to be below -3dB.Ĭheck this periodically as you record. Running the ACX_Check looks at three things: Peak Level RMS Level and Noise Floor. Let’s go through what the ACX Check analyzes and what you can do. What happens when you run the ACX Check analyzer in Audacity and it does not pass? Do you need to start over? Not necessarily. As you record your audio in Audacity for eventual submission to ACX (the marketplace for Audible where authors can find narrators and narrators can find authors - rights holders), you may need to fix problems identified by the ACX_Check analyzer in Audacity.
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