In each slot of the matrix's slots allow for one input shared to 3 outputs. What should also be included is in the two empty spaces of the slot, should be a phase offset. It wouldn't have to be anything incredible, but 180 and +/- 90 at least!
Yeesh, the lfo's can do phase trigger, why not the matrix? The thing is, with multed modulation sources, phase offset can sound astounding, and especially in 90 degree increments, with different modulation destinations.
Anyhow, do it Access! It's simple and righteous!