Nice explanation. Especially about drawbacks.
Quite interesting result of "disassembling" square wave with Fourier transform and "assembling in different order"
Old school way - recording with vintage gear. Disclamer: video is not mine.
Lowrey Organ model D-575. "Cotillion - 1983 - Theatre organ with memory presets and extensive features, including human voices and other sound effects" (from Wikipedia).
Nice explanation. Especially about drawbacks.