Audio 'Ducker' - what works and what's out there?

[csiking]

Hi,

I do spot production and am wanting to find a 'ducker' plugin for the Mac platform, specifically Digital Performer. Allow me explain exactly what I am looking for: A plug in that has a good 'look ahead' feature allowing the music bed to smoothly go down in volume before the voiceover comes in thus 'ducking' the music under the voice. I don't want something that slams down the volume a split second before the v/o comes it - that just sounds terrible. And since most of the spots that are done have more than one v/o this plug that is on the music track needs to allow for multiple 'inputs' so to speak.

Does anyone know of type of beast like this out there??

Thanks in advance for any input.