Sidechain Compression for Voice Overs

Hello Logic 7 users,

I've been recently doing a lot of audio work for video that has voice overs accompanied by a music/SFX track. I keep hearing that the 'professional' way to mix a voiceover track is to use the 'ducking effect' vis a vis sidechain compression.

Up till now I've just been automating the volume of the music track by hand. A bit time consuming, but a very functional result. None of my attempts at using the sidechain compression to duck the music track haven't sounded as good as a volume automation pass. Perhaps I just haven't been using the right compression ratios or something.

My question then is, are there any logic pro 7 users out there that could give me some advice on 'voiceover ducking' using Logic compressors.

Thanks for your help,
C