Info-Mac

I wanted to know if a digital audio would work in a cube. I know the bus speed is different 133 vs 100 but the cpu speed could be increased to compensate.

I doubt it as the tower CPUs were very large compared to the Cube CPUs - hence all the Cube-specific processor upgrades. They need a very slim heatsink profile. I'm not sure if the pinout is different, but a regular tower CPU wouldn't physically fit inside a Cube.