Double-click the desktop icon to launch the digital audio workstation in which you recorded the audio. Typically the last-saved session opens automatically. If this isn't the correct session, open the "File" menu, click "Open" and select the right session.
Open the mixer interface. Digital audio workstations typically have two interface options, mixer and arrangement. The arrangement window is for editing audio. The method for opening the different interfaces varies slightly according to which program you use, but you typically use a single tab to switch between the two.
Hit "Play" so you can hear the mixing adjustments in real-time.
Move the "Gain" fader for the lead vocals up to increase the volume. While mix levels are a matter or preference, a professional sounding mix will have prominent vocals. If you boost them too much, the red light on the volume units meter will flash. Aim for the highest level possible before the meter flashes.
Set the backing vocal levels slightly lower.
Adjust the remaining "Gain" faders to balance the sounds evenly, in relation to the loudest vocal.
Open the "Arrangement" tab and click on the lead vocal channel.
Click on the lead vocal channel to highlight it. This assigns subsequent mix commands to this channel only, rather than the mix in general.
Click "Effects" and select "Compression." This effect lets you temper the volume peaks in a piece of audio. By lowering the peaks, there is less discrepancy between the base volume level and the maximum. This makes for a more professional sound.
Adjust the "Threshold" control to determine the peak level at which the compressor effect kicks in. Repeat this process on all audio. Don't over-compress as this will rob the sounds of their dynamics.
Highlight the vocals.
Click "Effects" again and select "Reverb." This effect adds ambiance and space, creating a professional, spacial sound.
Adjust the "Depth" parameter to determine the intensity of the effect. For a more subtle effect, go for a lower setting.
Adjust the "Time" setting to determine how long the effect lasts. For a lingering reverb, set this parameter quite high.