Tokøta from Mastering.com walks through three character controls on Alchemy's oscillator page in Logic Pro.
Symmetry skews the waveform's shape, shifting its tone as you sway it left or right.
Sync slaves a copy of the oscillator to the main one, adding harmonics. Moving up in semitones brightens the sound with more high-frequency content, moving down darkens it.
Unison stacks multiple copies of the oscillator, up to eight, for a louder, thicker signal. Adding detune turns that stack into a wide, warm chorus effect.