Here are some more pictures and video of my Bender Sequencer. This one is built into an enclosure. Almost all of the parts for it (except the board and chips) were purchased at Radio Shack. I actually built the enclosure with all of the controls when I just had the circuit breadboarded. I had intended to build it using a prototyping board, then decided to create the PCB.
Here is what it looks like inside:
And, here is a video of the sequencer controlling an Atari Punk Console: