ALM MCF x2 -030 Manual

ALM Ikke kategoriseret MCF x2 -030

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Side 1/1

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→

InBP

Produkt Specifikationer

Mærke:	ALM
Kategori:	Ikke kategoriseret
Model:	MCF x2 -030

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