Buchla 200e series, User Manual

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Model 249e Dual Arbitrary Function Generator (
OBSOLETE
)
The 249e consists of two multi-segment function generators drawing from
separate data bases, each with its own clocking and addressing resources.
Data base editing
Organized as two 24 stage circular sequencers, each stage stores the values
of two control voltages, two pulses, a time value, and some logic functions.
The voltages may be interpolated or modulated with externally applied
voltages. The time value can be expressed in seconds, beat fractions, or
MIDI clock ticks, and can be scaled by an external voltage. Time values can
be scaled separately for each output section. Logic functions include the
incrementing of loop counters and conditional jumps.
Editing can be performed while sequencers are progressing. There are green
and blue LED's that indicate the current stage that each output is on; when in
the edit mode, an additional (green or blue) LED illuminates to indicate the
stage number being edited. To enter the edit mode hit
edit; then use the
stage select to select a stage number. Hit edit again to toggle between the
two displays; LED's indicate which display is being edited.
To program a voltage, hit
cv1 or cv2; an orange LED indicates that the LCD is
displaying the voltage; use the data wheel (upper right of the EDIT FACILITY)
to set it. Voltage range is from 0 volts to 10.00 volts in increments of .01 volts.
Above 10.00 volts are codes that cause the outputs to assume the values of
external inputs (ext A, ext B, ext C, ext D). If desired, hit pitch to see the
voltage displayed as a pitch. Pitch range is 0C to 8F# (octave
pitch). Resolution is 10 cents. Hit
interp to interpolate voltages 1, 2, or both.
(The output will arrive at the specified value in the time specified by the
duration.)
Hit duration to set the stage time. The following display appears for either
"mult" or "duration". Additional activations of the mult switch toggle between
the 3 screens; when mult is active (LED on), the data entry wheel selects the
ext source (one, extA, extB, extC, extD) in screen 1 and the tempo in screen
2. The duration switch selects between the two MSD's and the two LSD's in
screen 1. The data wheel adjusts the values and scrolls through the note
values in screens 2 and 3.