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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on either internal or external clock signal, start/stop, manual step (featuring debouncing!), sequencer cascading, basic glide (for portamento), attack decay sustain release envelope generator (ADSR low frequency oscillator (LFO Deleting the wiki page "Samba Duro" cannot be undone. Continue?

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