Revision 1.1 of the arpeggiator module based on Arduino nano Link to original project (https://www.ymnkmusic.com/diy-synths/arpeggiator/)
Updates from YourModulesMayVary:
Amended to work with push buttons using a 4067 Multiplexor and a couple of 74HC595 Shift registers. Schematic looks noisy but its a really simple build, just lots of buttons and LEDS's.
TO DO - 4067 can take longer than time to notice the trigger, I use gates for now. Needs optimising? perhaps interupts or something else?!