In my humble opinion, I believe the built-in vocalizers are marginal at best. Terry prefers the tc helicon products, while Uncle Dave and I seem to lean more toward Digitechs, but both are superior to what I've heard coming from keyboard's processors--even those that were tuned.

Yes, they will work with a condenser mic as well, but you may need an adapter if the mic comes with a standard, 1/4-inch phone jack. The adapters are available at most music stores and Radio Shack for about $10.

Good Luck,

Gary