Dreamweaver 4N: Four-note sequencer (PCB, schematic, source code, etc.) for creating unique music in real time

Dreamweaver 4N is a four-note sequencer with potentiometers, allowing users to create their own unique music.

There are six control knobs. Four knobs control up to four different notes, a fifth controls how long a note is played, and a sixth controls the spacing between notes. Each note can be turned on and off with a lock button.

While the Dreamweaver 4N has a small piezo buzzer that you can listen to, its real sound comes when you connect it to your sound system via the onboard headphone jack.
Features and Specifications:

     Dimensions: 82 mm x 100 mm (3.25 x 4 in)
     Weight: 100 g (~4 oz)
     Knobs: Six (6)
         Note Controls: Four (4)
         Duration: One (1)
         Spacing: One (1)
     LED: Four RGB WS2812B (fully programmable)
     microcontrollers: * ATmega328P
     Power supply: via USB Micro
     audio output options: Piezo buzzer and headphone jack
     Reset button: Yes
     Programming software: Arduino IDE
     Programmer: Onboard CH340