Creating 5.1 surround sound mix

1. Open 14-5.prproj.
2. Drag the music clips to the timeline as shown here. (figure) Note that Sonoma-Left and Sonoma-Right appear on the Timeline twice.
3. In the Audio Mixer, drag each track's 5.1 Panner puck to the proper location. (figure)
4. Set volume levels for tracks 1-5 that are similar to those you set for the stereo mix. For Audio 5 (the bass), adjust the volume using the LFE volume knob (why does the author mention this specifically? The other 4 also have volume knobs.) and place its puck in the center. (We have done this in the previous step.) Set volume levels for tracks 6 and 7 to 0 and -2, respectively.

You can move the clips on Audio 6 and 7 about 1/10 of a second (3 frames) into the Timeline to make it sound like they're coming from the back of the room. To do that, select each clip in turn (We can't do the following without select the clip. Chinese translation seems to omit this.), press the plus sign (+) on the numeric keypad, type 3 on the numeric keypad, and press Enter on the numeric keypad.

You can add a Reverb with a Size parameter a bit higher than what you set for the front channels. You might find that you don't need to have as much reverb for the front channels when you work in 5.1 surround sound.

subwoofer:  a loudspeaker responsive only to the lowest acoustic frequencies
http://english-for-chinese.blogspot.com/2009/07/off-topic-language-education-to-solve.html