VSYNTH was made to be easily playable by violinists. The four buttons on the right hand side controls which string is active, and the buttons on the left hand side control the pitch of the string. This control logic is similar to how a violinist changes the pitch of a violin.
Other than that, VSYNTH is a simple arduino-based square-wave generator with a few potentiometer knobs to control the volume and tone: one for volume, two for high-cut and low-cut RC filters.
Here’s a video of it playing the Zelda theme:
