I wanted to share with you my take on the Arduino sequencer. I took a slightly different approach than @analogoutput (great work!), such that this design can easily be tiled into 16, 32, 64 or even more steps.
Below is the current state of the schematic and a few photo’s from my own (8-step) build. The Arduino sketch and the up-to-date version of the schematic can be found on my github page: https://github.com/TimMJN/Arduino-Sequencer
Hope this is helpful to anyone!