Open your preferred audio production software, which will open the most recently edited session. If this is not the required session, click "File" and select "Open Recent." From the drop-down menu, click the session containing the recording you wish to convert to an a cappella mix.
Audition each vocal. Since each vocal will be "naked," check for mixing issues, such as excessive compression. These issues may sound good or be hidden in a full mix but will stand out in an a cappella mix. If you spot a flawed vocal, double-click its track to open the current mix settings. Make the necessary adjustment; for example, reduce the "Output Gain" on the compressor insert.
Create a vocal sub mix. Once you're happy with the sound of each individual vocal, click "File" and select "New Track." Name the track "Vocal sub mix." In the "Settings" section of the new track, select "Bus 1."
Click the channel strip for each vocal track, then click "Send To." From the drop-down menu, select "Vocal sub mix." This command sends the collective audio to a single track. You must send all vocal audio to the same track so you can mix it as a single piece of audio.
Click the sub mix to highlight it. Click "File," and select "Export as WAV" to render the file as a single file.
Click "File," and select "Open New." Click "File" again, and select "Import." Select "Vocal sub mix" from the drop-down menu to import it into the new session.
Click "Effects," and select "Reverb." Adjust the "Level" parameter to increase or decrease the intensity of the reverb. Mixing the vocals as an exported file lets you apply the same parameters and modifications to the entire vocal audio.
Click "Tools," then select "Equalization." Adjust the frequency band sliders to enhance the overall timbre of the vocal file. Tweak each dial to get your preferred sound.