Switchable cobblestone and basalt farm

A world record stone farm from the Chinese technical community, shown in a translated video. Generator pillars on a 6 game tick cycle make the blocks and TNT from a duper breaks them, so one machine gives cobblestone or basalt, switched by note blocks on top. It suits big servers and mega builds. It comes without a collection system, and builders work from the schematic: the video is a two minute showcase.

• Switch between cobblestone and basalt with the 4 note blocks on top of the machine. The creator's answer, eight viewers ask how.
• Plan a long build from the schematic. Three builders say so, one counts about 10 hours in hardcore for the 8 generator pillars and the rest.