I wrote the following up a long time ago. It works well for me. I grabbed most of it (verbatim) from one of their manuals.
# Sony Sound Forge
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# Resample to a New Sampling Rate
To change the sampling rate of an audio file, do the following:
1. Process > Resample
2. Set the new sampling rate for your audio file by using the New Sample Rate parameter.
3. Set the Interpolation Accuracy parameter.
This parameter specifies the accuracy of the resampling process.
A higher setting provides slower but more accurate processing.
Unless you have a really long audio file, you probably want to keep this parameter set to 4.
4. IMPORTANT: If you are converting from a higher sampling rate to a lower sampling rate,
be sure to activate the 'Apply an Anti-Alias Filter' during Resample option.
This prevents any high frequency content from the file with a higher sampling rate
from becoming noise in the converted file.
5. Click the Preview button to hear how your file will sound.
7. Click OK.
# Normalizing Audio
To use the Normalize function, do the following:
1. Select the data in your audio file that you want to normalize.
If you want to process the entire file, select it all by choosing Edit > Select All (or by pressing Ctrl-A).
2. Choose Process > Normalize
3. For the 'Normalize Using' parameter, choose the 'Peak Level' option.
4. Click the Scan Levels button to find the highest amplitude level in your audio data.
5. Adjust the 'Normalize to' parameter by dragging its slider up or down, which sets the highest amplitude level
to the level you'd like it normalized.
6. Click the Preview button (optional).
7. Click OK.
# Fade Audio
To apply a fade-in or fade-out to your audio data, follow these steps:
1. Select the data in your audio file to which you want to apply a fade.
2. To apply a fade-in, choose Process > Fade > In.
3. To apply a fade-out, choose Process > Fade > Out.
# Adjust Audio Volume - The Volume Function (Adjust Gain or Amplify)
To simply increase the amplitude of a data selection, use the Volume function.
1. Select the data in your audio file to which you want to apply amplitude changes.
If you want to process the entire file, select it all by choosing Edit > Select All (or by pressing Ctrl-A).
2. Choose Process > Volume to open the Volume dialog box.
3. To adjust the amplitude of your data, set the Gain parameter.
Move the slider up to increase amplitude.
4. Click the Preview button (optional).
5. Click OK.