[RWP] Side-chaining question

[Jes]

Hi all,
I notice that even when I have only two tracks, with only two channels 
of audio, the reacomp compressor still ducks the music track down when 
a voice track kicks in. Of course, when I mute the voice track, the 
music slowly fades back up. I thought you had to have four channels of 
audio to accomplish this, but it seems reacomp can do this with only 
two channels of audio on both tracks. How is this possible?