It features a streamlined workflow, assisted opcode
entry, draggable key-range and velocity
splits-points, and more.
It supports all SFZ 1.0 opcodes (full 2.0 support
coming soon) and directly exports to .sfz format.
I recommend using SFZ Designer in tandem with Plogue
Sforzando for quick previewing. When you re-export
your .sfz file all the changes are instantly applied
in Sforzando. This is a feature in the player.