2.1 output channel for bass management of stereo mix

[amathie]

I want to try using a subwoofer to extend the low frequency range of my main stereo monitors.

For various reasons I want to do the bass management in software prior to leaving Pro Tools so that I send the resultant three channels out to LEFT, RIGHT and SUB monitors.

Voxengo produce a Bass Management plugin for extracting low frequencies from the main stereo monitors and sending them to an "LFE" channel but this requires a 2.1 bus.

The Voxengo plugin needs to be inserted on a 2.1 channel but I don't have the option of creating a default 2.1 bus in Pro Tools.

Could someone please offer a simple and elegant way of doing this.

Thanks very much.