

Alternately, you could route your drums to Bus 1-2 and then use an aux send on each channel to send the same instruments to a new Aux Channel. You could route all of your drums to a bus, like Bus 1-2, and then create two (or more) Aux Channels that use Bus 1-2 as their input. You could send or bus your lead vocal to multiple Aux Channels (á la Michael Brauer’s multi-compression method), or you could simply duplicate your lead vocal channel to create the parallel channel. Parallel paths can be created in a mix via a few different methods. Mix that audio with the original track and you have the original mix with extra sub frequencies! General Advice
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A simple example would be to duplicate a full mix and low-pass filter the duplicate track so only the sub frequencies remain. Parallel processing can transparently enhance any aspect of any track or bus-augment the transients of a drum kit or add saturation to synths or vocals while maintaining the character of the original audio. This processing preserves the original sonic qualities of the track or bus, including the all-important dynamic range, while allowing you to tweak and add to the original sound. Then, the duplicate (parallel) track and the original track are mixed together.

Parallel processing is a method of signal processing where the original track or bus is duplicated and special signal processing is applied to the duplicate track.
