SCHLAPPI ENGINEERING BOUNDARY User manual

SCHLAPPI ENGINEERING
A multi-purpose modulation and signal control center consisting of a cycling slew and a four quadrant multiplier
RISE
The rate of rise (or attack)
CV (SHAPE)
Allows external voltage control
over the rise rate
If no cable is inserted the knob
controls the shape of the rise
CYCLE SWITCH
The SLEW/ENV section will
oscillate on its own
FALL
The rate of fall (or decay)
CV 1
CV for the 4Q multiplier
Normalised to the slew out.
RANGE SWITCH
Determines whether the BIAS is
positive only (for traditional VCA
usage) or can travel negative to
invert the signal
Useful to oset a ring modulated
signal.
BIAS
Controls default level of the VCA
CV (SHAPE)
Attenuates external voltage control
over the fall rate
If no cable is inserted the knob
controls the shape of the fall
INVERT (SHAPE) SWITCH
Inverts the cv going to RISE
In the up (+) position cv will
increase the length of the rise, and
down (-) decrease
If no cable is present it switches
between logarhythmic and
exponential curves.
INVERT (SHAPE) SWITCH
Inverts the fall CV
In the up (+) position cv will
increase the length of the fall, and
down (-) it will decrease
If no cable is present it switches
between logarhythmic and
exponential curves.
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INVERT SWITCH
Inverts CV 1
Useful for ducking eects
TRIG INPUT
Starts the Rise cycle of the slew
It will not retrigger during the rise
cycle, allowing for use as a
frequency divider or trigger delay
SLEW INPUT
Input to use to control the rate of a
bipolar input signal
The slew is scaled to be accurate
enough to use as a portamento
with volts per octave signals
RECTIFY INPUT
Full wave rectied input
Flips the negative half of a bipolar
signal up to be wholly positive
Useful for envelope following or
frequency doubling
BOUND INPUT
Replaces the threshold for the
cycling slew
Insert another envelope to achieve
bouncing ball eects or use as a
pseudo CA to control the envelope
output
SLEW
RECTIFY
RISE
BOUND
FALL
TRIG
EOR
CV 1
OUT
CV 2
OUT
IN
INVERT RANGE
4Q
VCA
BOUNDARY
FALLRISE
CV CV
CV 1 BIAS
CYCLE
INVERT
(SHAPE)
INVERT
(SHAPE)
SLEW
ENV
(SLEW OUT)
(SHAPE) (SHAPE)
OFF
ON
SCHLAPPI ENGINEERING
+
-
+
-
+
-
8V
8V
+
+
-
• Voltage Controlled Envelope
• Modulation oscillator (from below to above audio rate)
• Envelope following (rectify input)
• Bouncing ball fx (bound input)
• Frequency divider (trigger input)
• ortamento (slew input)
• Audio rate wave shaping (trig or slew input)
• VCA
• Ring Mod
• Soft limiting or distortion
Cycling Slew Functions 4Q Multi lier Functions

ENV/VCA
KNOB POSITIONS RISE 100% CCW
FALL 50% CW
CV 1 ` 75% CW
CYCLE OFF (DOWN)
OTHER KNOBS FULL CCW
OTHER SWITCHES UP
•TRIG signal at TRIG in or GATE signal at SLEW in
•Insert audio at IN, listen at OUT (VCA section)
•CV1 will control volume
•Experiment with RISE and FALL CV (shape) knobs
•INVERT CV1 and turn BIAS control CW to create a ducking eect
PATCHES TO START WITH
ENVELOPE FOLLOWER
•Start from ENV/VCA patch
•Remove GATE/TRIG
•Apply audio to RECTIFY input
•Especially good with drum machine
RING MOD
•Start from ENV/VCA patch
•Remove GATE/TRIG
•CYCLE switch ON (UP)
•Turn RISE/FALL CCW until audio rate
•BIAS RANGE switch +-8V (DOWN)
•Explore eect of BIAS
FREQUENCY DIVIDER
•Start from ENV/VCA patch
•CYCLE switch ON (UP)
•Insert signal to divide at TRIG
•Take output from EOR out
•RISE controls division
•FALL aects pulse width
BOUNCING BALL
•Start from ENV/VCA patch
•TRIG signal at TRIG in
•CYCLE switch UP (ON)
•Apply another envelope at BOUND
•Explore RISE, FALL and SHAPE
AUDIO SYNC EFFECTS
•Audio in at TRIG
•CYCLE switch UP (ON)
•RISE and FALL fully CCW
•Listen to the slew OUT
•Try changing RISE and FALL
•Add CV to RISE and FALL
•Move input to SLEW or
RECTIFY for dierent eects
PORTAMENTO
•V/OCT in at SLEW
•V/OCT out from slew OUT
SLEW
BOUNDARY BLOCK DIAGRAM
SLEW
RISE
RECT
ENVELOPE
LOGIC
4Q VCA
CV 1
FULL WAVE RECTIFIER
(SLEW
OUT)
(parentheses indicate connections normalled to unconnected inputs)
CV
RISE
BOUNDS
IN
GAINCV 1
CV 2
INVERT
RISE (OUT)
FULL WAVE RECTIFIER
SOFT LIMITER
THRESHOLD
LOGIC OUT
RISERISE
RISE
FALL
FALL
THRESHOLD DETECT
FALL
INVERT
INVERT +8V
+-8V
CYCLE
(OUT)
CV
RISE FALL
EOR
OUT
TRIG SET
(RISE)
RESET
(FALL)
OUT