From Fishman:

MATT HEAFY CUSTOM SERIES ALNICO PICKUP FEATURES:

Voice 1: (Modern Active High Output): The ideal active alnico sound. Full, round, and boosted, but with unprecedented articulation and dynamics.
Voice 2: (Crisp, clean and fluid): The clean, crisp neck humbucker tone youve always wanted without the thin, plinky sound you dont.
Voice 3: (Single Coil): Glassy, crystal-clear tone.
MATT HEAFY CUSTOM SERIES CERAMIC PICKUP FEATURES:

Voice 1: (Modern Active High Output): The ideal active ceramic humbucker tone. Crisp, searing crunch, tight bass with no mud, and a growl.
Voice 2: (Modern Passive Attack): Organic, high output, passive ceramic tone. Superb distortion characteristics with Fluence dynamics and response.
Voice 3: (Single Coil): Clear, bright clear tone.