ALM MCF x2 -030 Bruksanvisning
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                    MCF x2 -030
                
                                
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The MCFx2 is our state variable ‘MCF’ filter made double. It features 2 identical classic analog 3 pole state variable filter cores each with Low, 
High and Band Pass (or Notch) outputs. Direct and voltage control is provided for both filter cut offs and resonance.  Switches allow the filters 
to function as one, with the ‘Feed’ switch internally routing audio from one filter to the other in series and the ‘Link’ switch linking the cut off 
controls for both filter cores. MCFx2 expands on the great sounding MCF filter to offer both serial and parallel functionality for stereo opera-
tion, dual peak, tighter slopes and other complex filtering set ups.
RESONANCE CONTROL
Sets the level of resonant peaks 
atop the cut off frequencies. The 
resonance can get particularly 
aggressive going into self oscillation 
with the control past 12 o’clock. 
RES INPUTS AND ATTENUATORS
Attenuated control voltage inputs here are com-
bined with knob offsets to set the final resonance. 
Expects approx. -5V - 5V input. 
FREQUENCY CONTROLS
Sets the base frequency for the filter 
cut offs. The v/oct and frequency 
inputs are added to these. 
FREQ INPUTS AND ATTENUATORS
Control voltage inputs here are combined with 
knob offsets to set the final cut off.  Attenuversion 
control allows for both attenuation and inversion 
of the CV. Expects approx. -5V - 5V input.  
V/OCT INPUTS
Additonal cut off frequency control 
inputs. Cut off frequency approx 
doubles for every input volt.  Allows 
for key tracking and use as sine 
oscillator when filter self oscillates. 
LINK BUTTON
Links  the left cut off to parallel control both fil-
ters. The right controls will now set the max range 
of the right core. Both filters will track together 
when the right cut off is fully clockwise.
FEED BUTTON
Routes the output of the left filter core to the in-
put of the right (unless patched), with the desired 
output filter type selected via jumper at the rear 
of the module. 
AUDIO INPUT ‘In’
Signal inputs to the filter cores for processing. 
Input sources may need to be attenuated, filter 
will drive from hotter input levels. 
The Left input is normalised to the right (unless 
‘Feed’ is enabled).
OUTPUTS
Each filter output is 3 pole with an 
18dB/oct slope.   
Low - low pass filter outputs. Passes 
frequencies below the cut off. 
High - high pass filter outputs. Pass-
es frequencies above the cut off.
BP/Notch - band pass   notch filter or
outputs. Jumpers on the rear of the 
module select one or the other for 
each filter. 
Passes frequencies within (BP) or 
outside (Notch) a narrow region 
around cut off frequency. 
http://busycircuits.com/alm030
TECHNICAL SPECIFICATIONS
Power: +12V 85ma / -12V 85ma
Size:  14HP
Depth:  32mm
ALM030 / MCFx2
Limited Warranty
From the date of manufacture this 
device is guaranteed for a period of 2 
years against any manufacturing or 
material defects.  Any such defects 
will be repaired or replaced at the 
discretion of ALM.  This does not 
apply to;
•Physical damage arising from mis 
treating (i.e dropping, submerging, 
‘modding’ etc).
•Damage caused by incorrect power 
connections.
•Overexposure to heat or direct 
sunlight.
•Damage caused by inappropriate or 
misuse.
•Use of incorrect or non official 
firmware
No responsibility is implied or 
accepted for harm to person or 
apparatus caused through operation 
of this product. By using this product 
you agree to these terms. 
Support
Need help? Email your questions to 
help@busycircuits.com
For the latest news, additional info, 
downloads and firmware updates 
please visit the ALM website at 
http://busycircuits.com and follow 
@busycircuits on Twitter and Insta-
gram. 
Module Installation
With your modular synth 
powered  , connect the 10 pin off
end of the supplied standard 
eurorack power connector cable 
to the 10 pin power connector on 
the rear of the module. 
The red stripe on the cable 
should be orientated to match 
the text ‘RED’ marked on the 
rear of the module near the 
power connector (this is -12V). 
Connect the other 16 pin end of 
the cable to your eurorack bus 
board (Refer to your bus board 
documentation for the correct 
orientation).
You are now safe to power 
up your modular synth. If the 
module fails to power up, check 
that you have the power cable 
correctly orientated and have 
carefully read the manual. 
V/OCT Tracking Calibration
Calibration is performed by carefully 
adjusting the trimmers on the back 
of the module.  Apply 1V to V/Oct in-
put, and tune the self oscillating filter 
via front panel controls to C1. Next, 
change the input voltage to 3V and 
then adjust trimmer on reverse until 
you get C3. You may need to go back 
and forth and repeat the process a 
couple of times for best results. 
You should expect good tracking over 
at least 2 octaves.  Note the module 
ships pre-calibrated. 
ALM030 manual version: 0.1
High Notch Band Low
Resonant
Peak
Cut Off Cut Off
Link→
Feed→
LP
HP
BP
N
InBP
Produktspecifikationer
| Varumärke: | ALM | 
| Kategori: | Inte kategoriserad | 
| Modell: | MCF x2 -030 | 
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