Tenderfoot Electronics OMFG Oblique Multi Function Generator Instruction Manual
- June 1, 2024
- Tenderfoot Electronics
Table of Contents
Tenderfoot Electronics OMFG Oblique Multi Function Generator
Product Information
Specifications
- OMFG = 16HP
- CV EXPANDER = 4HP
- Depth = 33mm
Product Usage Instructions
Panel Layout
The OMFG features a 4-channel layout with identical controls for each
channel. The top channel includes a global threshold control.
Control Functions
The OMFG can be used for various functions including processing CV and
signals, adding glide, filtering, frequency divisions, creating A/R envelopes,
and more. Each channel includes controls for TH (EOC/LOOPING THRESHOLD), EG
(envelope generator trigger input), SLEW (signal processing input), LIN/LOG
(curve shape switch), LOOP SWITCH, EOC (end of cycle gate output), and OUT
(signal output).
Single Channel View
Refer to the user manual for detailed instructions on using each control for
individual channels.
CV Expander
The CV expander included with the OMFG allows control over rise and fall
times for each channel using CV inputs. The top channel also has control over
the EOC threshold.
Rise & Fall CV Input
Increasing voltage at this CV input results in faster rise and fall times for
the OMFG channel.
Rise CV Input
Increasing voltage at this CV input results in longer and slower rise times
for the OMFG channel.
Fall CV Input
Increasing voltage at this CV input results in longer and slower fall times
for the OMFG channel.
EG Input & Trigger/Gate Switch
The EG input allows using the OMFG channel as an attack-decay envelope
generator. The Trigger/Gate switch determines how gate inputs are interpreted
for envelope generation.
FAQ
-
Q: What power requirements does the OMFG have?
A: The current draw for OMFG is +12V = 150mA, +5V = 0mA, -12V = 110mA. Ensure your eurorack case has enough available current to power the module. -
Q: How should I connect the power cable to the OMFG?
A: Align the red stripe of the power cable with the indicated -12V marker on the back of the module when connecting power.
INTRODUCTION
OMFG is a 4-channel multi-featured slew limiter and function generator. It can be used for processing CV and signals, adding glide; filtering; carrying out frequency divisions; creating A/R envelopes; cascading modulation sources and more.
SPECIFICATIONS:
- OMFG = 16HP ;
- CV EXPANDER = 4HP
- Depth = 33mm
- CURRENT DRAW:
- +12V = 150mA
- +5V = 0mA
- -12V = 110mA
REQUIREMENTS
In order to use the OMFG, ensure the case you are installing it into uses a
eurorack specification power supply and has enough available current to supply
the module. When connecting the power cable, align the red stripe of the cable
with the indicated -12V marker on the back of the module.
PANEL LAYOUT
OMFG
The 4 channels of the OMFG are arranged from top to bottom, with identical
controls for each of the channels. The only exception is the threshold control
(TH) is located at the top of Channel 1, but is a global control.
SINGLE CHANNEL VIEW
CV EXPANDER
The CV expander for the OMFG is included in the box at purchase and adds the
ability to control the rise and fall of each channel with CV. The top channel
also has the control to affect the EOC threshold.
SINGLE CHANNEL VIEW
CONTROL FUNCTIONS
EG input & TRIGGER/GATE switch
The EG input is the main way to use the OMFG channel as an attack-decay
envelope generator. With the switch to the left position, any gate input will
be seen as a trigger and the envelope will cycle one time with no pause at
it’s maximum output level (8.5V). With the switch to the right, if a HIGH gate
is present at the EG input, the envelope will rise, and then hold at its
maximum level, until the gate falls LOW, at which point the envelope will
begin to fall towards 0V. (figure 5)
SLEW signal input
The slew input jack is the input for when using the OMFG channel as a slew
limiter. Slew limiting is used to slow the transients of a signal. Increasing
the rise or fall controls will increase the amount of time it takes for the
channel output to match the level of the signal at the SLEW input. Some uses
of adding slew time to a signal can be to add glide to CV signals and to
filter audio signals. Signals to be slewed can be bipolar. (figures 6 & 7
.)
LOOPING switch
Each of the OMFG channels has 3 looping modes, selectable via the central
switch (figure 8).
TH threshold control
The threshold control determines the voltage at which the EOC output for every
channel will switch to its HIGH state. When the voltage of the channel’s
output drops below this threshold, the EOC will be HIGH, otherwise it will be
LOW. Since the looping and cascading functions of the OMFG are triggered by
the EOC output, turning the TH up, will increase the looping frequency, while
simultaneously increasing the base voltage of the cycling signal. (figure 9,
10 & 11).
LIN / LOG shape switch
The shape switch affects the response curve of the slew limiter and envelope
generator functions. When set to linear , all slopes created by the channel
will be linear in shape. When set to log, all functions will have a
logarithmic attack and exponential decay. When used to generate envelopes,
logarithmic curves are often perceived as sounding more natural. Upon
switching to LOG mode, the length of any envelopes or loops will increase, so
may need some adjustment. (see figure 12).
OUTPUT ATTENUVERTER
Each channel signal output is preceded by an attenuverter circuit with control
via the attenuverter dial. This allows you to adjust the scaling or “volume”
of each channel. The 12 o’clock position is the OFF position. Rotating the
dial clockwise will increase the signal in the non-inverted direction until it
reaches unity gain at the limit. Rotating the dial anti-clockwise will
increase the signal level in the inverted direction. (see figure 13)
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