Sequencer

I am pursuing a step sequencer project and I have conglomerated some basic components that I thought that I may need.

-LEDs -Shift registers -Pushbuttons -Decoders -EEPROM -LCD -Communication jacks

Are there any other essential items that I may need?

Do you mean a step sequencer for an analog system ?

Then you will need some way to generate the control voltage for each step.