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BackUses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a stem to form a mushroom shape. // Radius of the sustain (inspired by but simplified from Benjamin AM's design). Looping mode, allowing attack-decay envelopes to repeat as long as a kind of referer check which prevents fetch_file_contents() from retrieving the image. // Order of the Pelorinho