ref: b382473f7b6827020f5544c8dcc730be8fc83f6e dir: /audio/sfx/trade_machine_1.asm/
SFX_Trade_Machine_1_Ch4: duty 2 pitchenvelope 1, 5 squarenote 15, 240, 240, 4 squarenote 15, 242, 80, 6 pitchenvelope 0, 0 endchannel