Ok, just thought of this.
GLD has built in sine generator, cool feature, why not make it cooler? My idea is this, allow that to be patched to a channel as the input, and allow another channel to act on the gate, effectively opening and closing the channel to the mix.
How would i employ this? Kick drum input in the system, maybe its a bit thin sounding, so run the kick into the sine channel gate allowing that to trigger the sine channel to open pumping like a 40hz tone down. with the right gating on that channel you could fatten up the mix a huge amount.