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Understanding and Using Your

moogerfooger®

CP-251 Control Processor

Moog Music Inc. Asheville, NC USA
©2000, 2003 by Moog Music Inc.

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Summary of Contents for moogerfooger CP-251

Page 1: ...Understanding and Using Your moogerfooger CP 251 Control Processor Moog Music Inc Asheville NC USA 2000 2003 by Moog Music Inc...

Page 2: ...IDI to CV converters or other devices that produce or accept analog control signals the CP251 enables you to create an amazing variety of dynamic synthesizer effects The following pages will first int...

Page 3: ...IS VOLTAGE CONTROL Imagine an oscillator module An oscillator produces a signal that repeats regularly If it repeats between 20 and 20 000 times a second then we hear it as a pitched tone Figure 1 sh...

Page 4: ...strength to a small fraction of a volt the VCO output is a now a pitched tone with vibrato Suppose we want to use both a keyboard and an LFO to control a VCO That is suppose we want to play a scale in...

Page 5: ...s of an externally applied control voltage Some other ways are varying the gain of a voltage controlled amplifier VCA varying the cutoff frequency of a voltage controlled filter VCF and varying the at...

Page 6: ...a moogerfooger MF101 Lowpass Filter Set MIX to 10 CUTOFF to 250 and RESONANCE to 10 These settings cause the filter to oscillate at its cutoff frequency Use the CUTOFF jack as the pitch control input...

Page 7: ...e CP251 s bottom plate which can be used when the unit is rack mounted The Red Jacks Eight of the CP251 s jacks are held with red nuts These input jacks are equipped with power for expression pedals Y...

Page 8: ...ockwise the full input signal is available at the output Connect patch cords as follows a From the triangular output of the LFO to the input of one ATTENUATOR b From the ATTENUATOR output to the VCTG...

Page 9: ...gth of the LFO control signal and the second ATTENUATOR knob is varying the amount that the expression pedal is changing the LFO rate Figure 5 Setup for trying out the ATTENUATOR modules FOUR INPUT MI...

Page 10: ...the pedal raises and lowers the waveforms However if you plug the pedal into input 4 it won t work because input 3 is a red jack and input 4 is not and only red jacks are equipped to activate an expr...

Page 11: ...ed down Experiment with various combinations of settings of the RISE and FALL knobs Finally experiment with the settings of the RATE and the ATTENUATOR knobs to see their effect Listen carefully to th...

Page 12: ...e MIXER knobs to mid position These connections combine the pedal voltage with the LFO triangular waveform Now step on the expression pedal Note that the tone rises in pitch and the triangular modulat...

Page 13: ...the NOISE jack to an ATTENUATOR IN jack b from the ATTENUATOR OUT jack to your VCTG pitch control input Note that the pitch becomes rough and jagged The amount of roughness is determined by the settin...

Page 14: ...expression pedal into the IN jack Move the pedal back and forth Note that the setting of the expression pedal rather than the NOISE waveform is now being sampled and held at the LFO rate Remove your e...

Page 15: ...Understand what each knob controls and what function each patch cord performs Try out your own variations You will be delighted at the range of effects that you will discover Filter Sample and Hold Ef...

Page 16: ...ion 2 Footsteps Same as basic setup except connect the expression pedal to the S H IN jack Expression pedal sweeps filter cutoff but in steps that are in time with the CP251 LFO Fast spastic pedal swe...

Page 17: ...0 2 Hz ATTENUATOR to 5 b MF101 AMOUNT 0 MIX 10 CUTOFF mid position RESONANCE 7 This patch features triangle wave modulation of the MF101 filter The attenuator controls the amount of up and down sweep...

Page 18: ...roduce a modulation waveform in which the falling part is much faster than the rising part Experiment with the LAG knobs the ATTENUATOR knob and the MF101 CUTOFF and RESONANCE knobs to explore the dif...

Page 19: ...19 Talking Bass A patch that uses both an MF101 Lowpass Filter and an MF102 Ring Modulator Figure 13 Setup for Talking Bass Connect patch cords as follows a MF101 AUDIO OUT to MF102 AUDIO IN...

Page 20: ...ys yeow Experiment with the settings of the LAG RISE and FALL the MF101 CUTOFF and RESONANCE and the MF102 FREQUENCY and MIX knobs Dual LFO Modulation This setup uses your CP251 and an MF102 to illust...

Page 21: ...aveform and OFFSET raises and lowers the voltage at the center of the dual LFO waveform thereby raising and lowering the pitch of the carrier oscillator Now disconnect the monitor amp from the CARRIER...

Page 22: ...ser The sharp voltage rise at the beginning of each step creates a wideband click This causes the phaser to ring simultaneously at several frequencies thereby converting the click into a distinctive p...

Page 23: ...s not in exact synchronism with the CP251 LFO In fact if you vary the setting of the MF103 RATE knob you will hear the loudness pattern of the pulses change For now leave the MF103 RATE knob at 3 Next...

Page 24: ...re determined by the RISE and FALL knobs Nominal time constants are 1 millisecond 100 milliseconds and 1 second when the knobs are fully counterclockwise in midposition and fully clockwise respectivel...

Page 25: ...is 3 volts Nominal input resistance at the TRIG jack is 10KW Triggering occurs when the voltage at the TRIG jack descends through the 1 volt nominal trigger threshold Nominal input to output gain is u...

Page 26: ...e at all pedal control input jacks Thus if you plug a tip sleeve phone plug into one of the pedal control input jacks of an MF Series device then none of the pedal control jacks on that device will be...

Page 27: ...obtain approval Wrap your CP251 carefully and pack it with the power adaptor in its original carton The warranty will not be honored if the product is not properly packed Then send it to Moog Music UP...

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