The somewhat slow and sad second stage theme of Sonic the Hedgehog. Fitting, for a stage whose gameplay is in fact very slow compared to what you'd expect from Sonic.
There's two customizable parameters here: vibrato and octave. You can choose between a slow, subtle vibrato, or a fast and pronounced one. You can also boost the octave of the lead by one since I accidentally defined the octave incorrectly when starting the port and thought to myself, "hey, this isn't too bad".