Bit changer function in Logic Pro?

Question

I'm replicating my Yamaha 4-OP editor in a Logic environment.

In MIDI Designer, to turn each operator on or off, there is a SysEx fader being controlled by 4 bit changers.

Pretty simple, but I have absolutely no idea how to do this in Logic (if it's at all possible?)

Any help is appreciated!

 

[edit: i do realize that a drop-down menu with all 16 possible configurations is more than enough, since i always have all 4 operators on anyway!]

Comments

We're not aware of many programs that have this odd bit-changer feature. We created it for EZB and his DX-7 layout, but we're seeing it's useful for other things, too.