ACX Audition Also Known as ACX Test Clip and ACX Sample. An Audition is a short reading you can submit to ACX to prove your performance quality before you submit longer works. ACX will review your work and post comments. The work does not have to be produced using Adobe Audition. Works must be perfect and 'Retail-Ready'. ACX will not change any work once you submit. Auditions should be around three to five minutes long. Auditions should be mono (one blue wave). Stereo is accepted, but your production must be consistent. Auditions should have 0.5 to 1 second of Room Tone at the beginning and 1 to 5 seconds of Room Tone at the end. Auditions must be in MP3 sound format with constant bitrate of 192, minimum. Auditions must have sound peaks no louder than -3dB. Auditions must have a voice RMS (loudness) value between -18dB and -23dB. Auditions must have Room Tone (natural background room sound without you performing-or moving-or breathing) quieter than -60dB. You can submit this audition to ACX after filling out a questionnaire. https://audible-acx.custhelp.com/app/browse/c/3549 Audacity has tools to help you meet the technical requirements. Audacity Forum has a section for Audiobooks. You have to register to post. New Posters may have a delay before posts become visible. https://forum.audacityteam.org/viewforum.php?f=64 Audiobook Mastering. https://wiki.audacityteam.org/wiki/Audiobook_Mastering Audiobook Testing - ACX Check. https://wiki.audacityteam.org/wiki/Nyquist_Analyze_Plug-ins#ACX_Check