Has anyone here ever done this?

I've had the Fishman transducer in my D-18 for about 10 years and am happy with the sound but...

I'm interested in adding an M1 into the mix.

The Fishman is an active pickup (w/ 9v) under-saddle transducer.

What would my options be blending these two pickups?

Any info would be greatly appreciated

Kind regards