Patchbay

The Patchbay contains six independent utility circuits for signal routing, processing, and conversion. Each is described in its own section below.

Multiples

Purpose

Three buffered mults that duplicate an input signal to multiple outputs. Unlike passive mults (Y-cables), buffered mults make electrical copies that maintain voltage accuracy -- critical for distributing 1V/oct pitch signals to multiple oscillators.

Patch Points

Jack	Type	Normalled To	Notes
MULT IN 1	Input	LFO Z OUT	Input to first mult pair. Normalled from LFO Z
MULT IN 2	Input	MULT IN 1	Input to second mult pair. Normalled from MULT IN 1 (cascade)
MULT IN 3	Input	MULT IN 2	Input to third mult pair. Normalled from MULT IN 2 (cascade)
MULT OUT 1 (x2)	Output	None	Two copies of MULT IN 1 signal
MULT OUT 2 (x2)	Output	None	Two copies of MULT IN 2 signal
MULT OUT 3 (x2)	Output	None	Two copies of MULT IN 3 signal

The cascade normalling means patching a single signal into MULT IN 1 (with nothing in IN 2 or IN 3) distributes it to all 6 outputs. Patching into IN 2 breaks the cascade at that point.

LEDs

MULT IN 1 LED indicates polarity (green = positive, red = negative) and voltage level (brightness).

Summing

Purpose

Adds two input voltages together, producing their sum at the output. Useful for combining CV sources (e.g., adding an LFO to an envelope) or mixing audio signals.

Patch Points

Jack	Type	Normalled To	Notes
SUM IN 1	Input	None	First input signal
SUM IN 2	Input	None	Second input signal
SUM OUT	Output	None	Sum of both inputs

Inverter

Purpose

Inverts a signal so positive voltages become negative and vice versa. Useful for flipping envelopes (attack becomes decay shape), reversing LFO direction (saw becomes ramp), or creating inverted modulation.

Patch Points

Jack	Type	Normalled To	Notes
INVERTER IN	Input	ENV B OUT	Signal to invert. Normalled from Envelope B output
INVERTER OUT	Output	None	Inverted version of input

Bipolar-to-Unipolar

Purpose

Converts a bipolar signal (e.g., +/-5V LFO) into a unipolar signal (0-5V). Adds +5V to the input then divides by 2. Essential when you want modulation that only increases (or only decreases) a parameter from its base value, rather than oscillating around it.

Patch Points

Jack	Type	Normalled To	Notes
BI IN	Input	LFO Z OUT	Bipolar input. Normalled from LFO Z
UNI OUT	Output	EXP SRC IN	Unipolar output. Formula: (input + 5V) / 2. Normalled to EXP SRC

Exponential Source

Purpose

Routes a CV signal to the rear panel EXP OUT jack for controlling an expression pedal input on an external effects pedal. The EXP LEVEL knob attenuates the signal before it reaches the back panel.

Controls

Patch Points

Jack	Type	Normalled To	Notes
EXP SRC IN	Input	UNI OUT (BI>UNI)	CV source for expression control. Normalled from BI>UNI output

Ring Modulator

Purpose

Multiplies two input waveforms, producing a signal containing the sum and difference frequencies of the inputs. Creates metallic, inharmonic, bell-like tones at audio rates, and complex modulation shapes at LFO rates.

Patch Points

Jack	Type	Normalled To	Notes
RINGMOD IN 1	Input	VCO A SINE	First input. DC coupled (works with LFOs and audio). Normalled from VCO A sine
RINGMOD IN 2	Input	VCO B SINE	Second input. DC coupled. Normalled from VCO B sine
RINGMOD OUT	Output	MIXER IN 1, VCA B IN	Ring mod output. Normalled to Mixer IN 1 and VCA B input

LEDs

RINGMOD OUT LED indicates polarity (green = positive, red = negative) and amplitude (brightness). At audio rates, acts as an output level indicator.

Normalled Connections Summary

• MULT IN 1 normalled from LFO Z. Cascade normalling distributes to all 6 mult outputs.
• INVERTER IN normalled from ENV B output. Provides inverted envelope without patching.
• BI IN normalled from LFO Z. Converts LFO Z to unipolar automatically.
• UNI OUT normalled to EXP SRC IN. LFO Z -> BI>UNI -> EXP SRC chain works with zero cables.
• RINGMOD IN 1 normalled from VCO A sine. RINGMOD IN 2 normalled from VCO B sine.
• RINGMOD OUT normalled to MIXER IN 1 and VCA B IN.