Model 700 Programmer – Operations Manual
© Sequential Circuits Inc. 1979 PDF Version by the Emulator Archive 2002 Page 4
operation of the envelopes based on the different input controls possible. The
overall operation of the envelopes is very close to that on your synthesizer.
Both envelopes also have an AMOUNT control that defines the gain of the
envelope. The envelopes have a 13-volt peak when the AMOUNT is all the way
clockwise, and is reduced from there. On envelope 1, this will operate as a
overall volume control. On envelope 2 (filter control) this will have the effect of an
"amount of envelope” control. Envelope 2 also has an OFFSET control, which is
simply a DC voltage that is added to the envelope. The OFFSET is not controlled
by the AMOUNT control. It has the function of acting as an “initial cutoff
frequency” control. Both AMOUNT controls and the OFFSET control are
remembered as part of the program.
1.4 Voltage Sources
The three voltage sources are usually used for oscillator control, though they
could be patched to any control voltage input on your synthesizer. They have a
five-volt range, which corresponds to a five-octave range on your oscillators. The
VOLTAGE controls step in semitone steps when turned (quantized), which
makes tuning extremely fast and easy. The voltage steps in the programmer are
very accurate, but often times the oscillators in your synthesizer may not be.
Remember that if your synthesizer is out of tune normally, it will be out of tune
with the programmer. Some synthesizers may require that the programmer be
tuned to match the synthesizer. This is fairly easy to accomplish. Remove the
back panel. There is a trimmer control (black) in the lower right hand corner of
the circuit board. This controls the overall gain of the output voltage from the
programmer. It can be raised or lower as required for your oscillators to track.
The tuning method is as follows:
1) Patch VOLTAGE 1 to one oscillator, and VOLTAGE 2 to a second. (Be
sure that you tune your synthesizer according to the manufacturers
instruction before performing these adjustments.)
2) Turn both VOLTAGE 1 and 2 fully counter clockwise.
3) On your synthesizer, tune the two oscillators exactly to each other.
4) Tune one oscillator two octaves above the other using the VOLTAGE
control on the programmer.
5) Turn the trimmer control on the circuit board of the programmer until both
oscillators are in tune, the programmer should now be in tune with your
synthesizer.
