There will not be a step by step for ColorChord. All sections can be built using many styles and selection of whatever components desired.

                     The building blocks are the following.

1 - Audio oscillator. Three are required. I chose the 555 timer.

     Each oscillator is adjusted to a chosen frequency that relates

     to one of the three primary colors red, green or blue.

2 - Clock. I used a two transistor astable multi-vibrator running

      between 10 and 20hz

3 - Five step FSM sequencer. I used the first, third and fifth outputs.

     I choose DTL but 74xx TTL logic would save space.

4 - Audio amp. I used a scraped unit from a CD player.