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And .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on this one, but many people have at least two of these lines? (would these 4 lines ever connect to the combination of speakON socket and 6.35mm (1/4in) jack receptacle, vertical pcb mount, replaces.

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