via this auction
Pics of the inside below.
"A HOLY GRAIL OF PEDALS.
HISTORICALLY SIGNIFICANT DEVICE:)
DESIGNED BY TOM OBERHEIM. MAESTRO WAS ONE OF THE FIRST PEDAL MAKERS, IN THE 70'S.
THESE ARE RARER THAN RARE, AS YOU KNOW.
IT'S TWO DEVICES IN ONE: WHEN "FILTER" IS SELECTED, THE INSTRUMENT (GUITAR, ETC) THAT'S PLUGGED IN, AUTOMATICALLY ACTIVATES AN ENVELOPE FOLLOWER, THAT CONTOURS THE MODIFIED LOW PASS FILTER'S RESPONSE CURVE ACCORDING TO THE DYNAMICS OF THE INPUT.
A VERY CONTROLLABLE (FILTER CONTROL) DYNAMIC EFFECT, A LITTLE MORE SUBTLE THAN "AUTO WAH".
THE REAL FUN COMES WITH THE "SAMPLE/HOLD" POSITION. HERE, THE FILTER'S RESPONSE IS CONTROLLED RANDOMLY, BUT WITH AN OVERLYING RHYTHMIC ELEMENT DETERMINED BY THE CONTROLLABLE LFO (S/H SPEED). IT'S NOT UNLIKE THE SOUND PEOPLE THOUGHT COMPUTERS MADE IN THE 60'S-70'S:)
BECAUSE SUCCESS WAS UNKNOWN, SOME ELECTRONIC PARTS WERE SELECTED BY THE MANUFACTURER THAT WERE OF THEN-LESSER-QUALITY. THESE IMPART A VERY DESIRABLE AMOUNT OF SLIGHT GRIT TO THE SOUND.
SINCE THE AVAILABILITY OF SUCH PARTS HAVE LONG SINCE VANISHED, THE ORIGINAL CIRCUIT IS THE ONLY WAY TO GET THIS PARTICULARLY FAVORED SOUND.
EXCLUSIVE TO THIS PARTICULAR DEVICE: THERE ARE "TRIMS" INSIDE, THAT HAVE BEEN OPTIMIZED.
ALSO EVERYTHING HAS BEEN PROFESSIONALLY CLEANED AND LUBRICATED."
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