Click on the "Mute" button next to the track or tracks you wish to eliminate from your mix. This is a button, typically indicated by a capital "M" located on both the individual track lanes and the central mixing hub of your audio project. An exception to this rule, however, can be found in Image-Line's FL Studio, where muting a track can be achieved by clicking on the green button to the left of your track lanes. If the button is dark green, the track is muted; if it's glowing bright green, it is still audible.
Click the "Solo" button next to a track to eliminate all the others from your final recording besides it. Again, this applies to nearly all digital recording software aside from FL Studio, which lacks a solo function. The "solo" button can be found in the same location as the "Mute" button and is commonly indicated by a capital "S." If you click the "Solo" button on other tracks once you have one soloed, it will also allow them to become audible for rendering.
Drag your mouse over the portions of a song you wish to render in digital audio recording programs such as Avid Pro Tools, Adobe Audition and Digital Performer. Though this doesn't apply to programs rooted in software-based synthesizers such as Propellerhead Reason and FL Studio, it is a necessary step in telling live audio-based programs what portion of the recording you want to bounce down. Even if you've chosen to mute or solo portions of your project for bouncing, you will still have to drag your mouse over them or press "Ctrl + A" to select all of them; otherwise, you'll end up with an empty audio file.