Click "File" and select "New Audio." Name the new audio track "vocal sub mix." Click on the channel strip for this track and select "Bus 1." A bus is an internal mix channel.
Click on the left-hand channel strip of a vocal track. Select "Send To" and click "vocal sub mix." Repeat this process for vocal track so that they are all sent to the same bus.
Click on "vocal sub mix" to highlight it. Click "File" and select "Export as Wav."
Click "File" and select "Open New." Click file again and select "Import." Click on "vocal sub mix" when prompted.
Select "Wave Hammer" from the "Tools" menu. This compressor is one of three mastering plug-ins that come "bundled" as part of the Sound Forge mastering program. Compressors limit the dynamic range of audio by cutting the highs and boosting the lows. The overall effect is a more compact volume spectrum with fewer peaks and dips.
Adjust the "Threshold" and "Ratio" parameters on the Wave Hammer interface. Threshold determines what level of volume triggers the compressor. A low threshold setting creates a more intense compression as the compressor cuts slightly loud and boosts slightly quiet signals. A high threshold results in a more subtle compression, as only very loud and very quiet signals are compressed. The ratio parameter determines the amount of cut or boost. Adjust these to your preference, but don't over-compress the vocal as this will create a "flat" sounding track with little dynamic range.
Select the "Paragraphic EQ" from the tools menu. This is an equalization tool that lets you adjust the frequency range of the vocal audio. It functions in a similar way to the compressor, but instead of boosting or cutting volumes you boost and cut frequency bands.
Adjust each frequency in turn band by 15 decibels, starting with lowest frequency. Do this by either typing in a figure 15 greater than what is currently in the "db" box, or "drag" the frequency up by "+15" in the analyzer window. As you drag, an info bar appears telling you how much of an increase you're affecting. Once boosted, listen for "clipping." This is characterized by a distinctive fuzziness. Reduce the "Gain" of ny frequencies that clip at 15 decibels higher. This creates a more balanced frequency range and reduces frequency peaks.