There's nothing like Excalibur. It's the plugin that creates whole new worlds. Need a classical delay unit with feedback and EQ? Need to sync it to tempo? It's right here. Need a chorus to fatten an instrumental part? Or a flanger that goes from mild to wild? That's all in Excalibur. Maybe you need a distorter. Or pitch shifter. Need to do bit reduction to model an old processor? How about a resonant filter for 'wah' effects? Or a resonator for truly spooky worlds? Maybe a little reverb? Or a phaser? This is the place.
These are all great effects all by themselves. But the real power of Excalibur is the way effects can be combined and modulated. There are 4 signal chains (called Voices) that can be treated independently or looped through one another. Most parameters can be modulated from a huge list of modulators--LFOs, input/output levels, soft controls on the GUI--to make effects that are dynamic. They respond to the signal. They respond to tempo.