A-107
Contents
1. and manual control for Step setting Step Clock digital signal input for clock gate triggered advance to next step Step Reset digital signal input to set the step to a position within the chain defined by the momentary step CV Morph two CV inputs with without attenuator and manual control for morphing time System A 100 Multitype Morphing Filter A 107 Filter Unit Controls Audio ln audio input of the filter Freq two CV inputs with without attenuator and manual control for filter frequency Res two CV inputs with without attenuator and manual control for filter reso nance emphasis Amp two CV inputs with without attenuator and manual control for filter amplifica tion Audio Out audio output of the filter A 107 Multitype Morphing Filter 4 Programming Unit Controls Display This is a 3 digit LED display with three decimal points These display modes are available 507 current Step within the filter chain working buffer range 01 32 FU Filter type of the currently selected step within the chain working buffer range 01 36 COI number of the Chain that is called up from the memory range 01 64 PGi number of the chain that is used to store Program the working buffer into the memory range 01 64 the character S is alread used for Step gt P Program The left and middle decimal point of the display indicate morphing The points are flashing alternatel2. sequencer or MIDI to CV the offset control may be set to zero A 107 Multitype Morphing Filter Step Clock The positive transition low to high of a Clock signal at this input advances to the next step of the current chain If step 32 is reached the next clock switches back to step 1 of the chain US If an external Step CV and Step clock signal is applied the effects of both signals will interfer Whenever the step control voltages changes the step corresponding to this voltage is addressed immediately Therefore we recommend to apply no varying control voltages to the Step CV inputs in the clocked mode unless the interfering effects are intentional Step Reset The positive transition low to high at this input resets to the step of the chain that corresponds to the momentary step CV manual external The manual step control has to be turned to zero if a reset to step 1 is desired A slowly varying external control voltage at the step CV inputs can be used to reset to different steps 10 System A 100 DHE PPE The step reset input is also helpful to synchronize filter sequences by applying a sequener generated reset signal to this input e g Morph This group of controls serves to define the morphing time between succeeding filters It contains a manual Morphing control and two Morphing CV inputs one with attenuator one without attenuator Applying a slowly variable control voltage at one of th
3. buffer into one of the 64 non volatile memories see item PROG The working buffer is erased during power off If you want to keep the working buffer you have to store it into one of the 64 non volatile memo ries see item PROG After power on chain 1 is called up from the non volatile memory A 107 Multitype Morphing Filter Chain Operating this button calls up a chain from the me mory i e the chain is copied from the non volatile memory into the working buffer To avoid wrongly operation one has to keep the button pressed for about one second before the function is executed The display shows the number of the last chain in use e g C23 and the right decimal flashes slowly as a warning that the chain in the working buffer will be overwritten if the process is continued If the chain button was operated wrongly one simply has to operate the Step button or the Filter button to reach the corresponding display mode How to copy a chain from the memory into the working buffer g Select the number of the desired chain by means of the Value control m Operate the Chain button again and hold it pressed for about 2 seconds GET During this time the right decimal points flashes fast and the display shows GET US Ifyou release the chain button while the display shows GET the copy procedure is interrupted and the right decimal point flashes slowly again System A 100 After about 2 seconds the c
4. is lifted up see chapter 7 For the filters 01 18 see chapter 7 the resonance can be adjusted right up to self oscillation in which case the filter will behave like a sine wave oscillator The filters 19 36 do not support self oscillation Even the effect of resonance and self oscillation is treated more detailed in the manuals of other A 100 filters e g A 121 A 123 A 124 A 108 A 105 122 Amp This group of controls serves to define the filter ampli tude or level It contains a manual amplitude control and two amplitude CV inputs one with attenuator one without attenuator This control group is assigned to the final VCA nothing but an exponential VCA that is connected to the filter output The filter output level is manually adjusted with the manual amplitude control To modulate the amplitude by an external voltage e g ADSR LFO sequencer the control voltage has to be patched into one of the two amplitude control inputs One input is equipped with an attenuator to control the resonance modulation amount of the corresponding input 12 System A 100 Audio Out Filter output sends out the filtered and level control led audio signal 6 User examples IS SH In the following we use the abbreviations LP lowpass BP bandpass HP highpass AP allpass NF notch filter Before you continue with more complex appli cations of the A 107 we recommend to ac quaint with the 38 fil
5. 1 Introduction Module A 107 is a completely new voltage controlled filter that has available 36 filter types different versi ons of low pass high pass band pass notch all pass and filters with new response curves that have no name up to now Of course the standard VCF controls are available manual and voltage control of filter frequency and resonance For the filters of the first group 1 18 self oscillation is possible the filters of the second group 19 36 do not feature self oscillation On top of it a final VCA is available even with manual and voltage control All external control inputs are available twice one with attenuator and one without The 36 filters are organized in two groups of 18 filters each The filters can be arranged in 64 different filter chains Each chain consists of 32 steps The sequence of a filter chain is passed through while the manual control is operated or the external control voltage changes from 0 5V 64 filter chains can be programmed by the user and stored in the non volatile memory of the module System A 100 Multitype Morphing Filter A 107 The transition between filters can be soft morphing or hard switching The morphing time manual and voltage controlled defines the transition time between succeeding filters from a few milliseconds switching up to about 10 seconds Additionally a clocked mode is available This means that the steps of the currently selected fil
6. J Le ZS i p 2 Man J 1 1 ManValue w 0 CV2 CV1 Clk Res CV2 CV1 KA Audio In Step Morph Fig 1 A 107 Overall view DHEP FER 2 Basic principles Module A 107 consists of the 100 analog filter unit with the parameters filter frequency resonance em phasis and amplification and the digital control unit with display corresponding controls buttons rotary encoder and non volatile memory The control unit manages the memory that contains the 64 filter chains with 32 steps each The control unit is responsible for all parameters that refer to switching and morphing of filters within the selected chain the control of the analog filter unit to obtain the desired filter and the memory management The buttons Step and Filter determine if the display shows the Step number S within the currenty selec ted filter chain i e the so called working buffer or the filter type F The buttons Chain and Prog are used to transfer a filter chain between the non volatile memory 64 me mories and the working buffer The values for Step Filter and Chain are set by the endless rotary encoder labelled Value System A 100 Multitype Morphing Filter A 107 Provided that a clock signal is applied to the Step Clock input the clocked mode is activated In this mode each positive transition of the clock signal trig gers the advance to the next step of the filter chain in the working buffer If step 32
7. OEP FER 12 dB Notch Allpass lower frequencies at Notch Highpass Soft Notch shifted Bandpass tenuated 31 Allpass higher frequencies at Highpass with step Wave filter Lowpass Soft Notch Band tenuated pass Notch Highpass Lowpass Notch Highpass Soft Notch Soft Notch 18
8. e Morphing CV leads to modulations of the morphing time A control voltage of OV at Morphing CV input 2 corre sponds to a few milliseconds switching 5V to about 10 seconds morphing time The effects of the manual morphing control and the external morphing CV inputs are added up The ma nual control can be used to adjust an morphing off set The external control voltage e g from a LFO or sequencer could modulate the morphing time the offset For bipolar control voltages e g from an LFO an offset is required to take advantage of the full voltage range For positive control voltages e g from an ADSR sequencer or MIDI to CV the offset control may be set to zero JUEPFEA 5 Filter Unit Controls Audioln e Level Control The socket is the audio input of the filter were the audio signal has to be fed in The attenuator controls the input level of the signal to be filtered If the filter s output signal is distorted turn this control down unless the distortion is wanted as a special effect Distortion appears approx above middle position of the control 5 for normal A 100 signals e g VCO A 110 Frequency This group of controls serves to define the filter fre quency It contains a manual frequency control and two frequency CV inputs one with attenuator one without attenuator The filter frequency is manually adjusted with the manual frequency control To modulate the cut off frequency by an external
9. e clock divider A 160 to obtain a smaller clock frequency e Rhythmical advance by means of clock divider and sequencer A 160 161 combined e g with the logic module A 166 and using the step reset input of the A 107 e more complex rhythmical filter sequences by controlling the step clock by the trigger output of a analog sequenzer A 155 or MAQ16 3 or a trig ger sequenzer Schaltwerk 13 A 107 Multitype Morphing Filter Morphing But the real fun arises with the morphing features of the A 107 Even here we recommend first to find out the sound behaviour between two different filters as it is a big difference to morph e g from 6dB LP gt 24 dB LP or LP gt HP or BP gt NF or HP gt AP and so on For this you may use the following system O Program a chain with two different filter types at step 01 and 02 O Patch the rectangle output of a LFO to the step CV2 input of the A 107 and adjust the frequency of the LFO to about 1 Hz or less O Turn the manual step control the attenuator of step CV2 and the manual morph control to zero Select the display mode STEP Look at the display and turn up the attenuator control of step CV2 slowly until the display shows alternately 01 and 02 O Feed the audio input of the A 107 with the desired audio signal The sawtooth output of a VCO is a good start but even a complex audio signal is suitable for the first tests O Set the controls of the filter section to suitable posit
10. g buffer is stored into chain 53 by means of the function PROG Value This endless rotary encoder is used to select steps filter types and chains as described in the sections above US Ifan external Step CV or Step clock signal is applied the effects of the external signals and the value control will interfer To select a value with the Value control no step CV or step clock should be applied System A 100 Multitype Morphing Filter A 107 Step This group of controls serves to address a step within the currently selected filter chain It contains a manual Step control and two Step CV inputs one with at tenuator one without attenuator A variable control voltage applied to a Step CV input leads to a step selection and consequently filter selec tion accordingly to the applied control voltage The setting of the Morphing section defines if the transition time between succeeding steps resp filters A control voltage of OV at Step CV input 2 corresponds to step 01 5V to step 32 The effects of the manual step control and the external step CV inputs are added up The manual control can be used to adjust an offset e g step 16 The external control voltage e g from a LFO could modulate the step value around the offset e g 11 21 16 5 16 5 For bipolar control voltages e g from an LFO an offset is required to take advantage of the full voltage range For positive control voltages e g from an ADSR
11. hain is copied from the non volatile memory into the working buffer Prog Operating this button stores a chain into the memory i e the chain is copied from the working buffer non volatile memory To avoid wrongly operation one has to keep the button pressed for about one second before the function is executed The display shows the number of the last chain in use e g P19 and the right decimal flashes slowly as a warning that the chain in the memory will be overwrit ten if the process is continued If the chain button was operated wrongly one simply has to operate the Step button or the Filter button to reach the corresponding display mode How to store a chain into the non volatile memory D Select the number of the desired chain by means of the Value control D Operate the Chain button again and hold it pressed for about 2 seconds PRG During this time the right decimal points flashes fast and the display shows GET US If you release the button while the display shows PRG the store procedure is interrupted and the right decimal point flashes slowly again After about 2 seconds the chain is stored into the selected chain of the non volatile memory and the display shows the latest step This operation concept makes it possible to copy chains within the non volatile memory To copy e g chain 17 to chain 53 one has to copy chain 17 by means of the CHAIN func tion into the work buffer Then the workin
12. ions full amplitude medium filter frequency small or medium resonance O Now you will hear alternatively the two filters that were programmed to step 01 und 02 of the chain OU 14 System A 100 see first item above CT Turn up slowly the morph control to find out how the switching between the two filters turns more and more into morphing O Alter the setting of the filter section filter frequency resonance amplitude to hear the effect of these controls Increase the LFO frequency that controls the step CV From a certain LFO frequency depends upon the setting of the morphing time the filters of step 01 and 02 will not be reached as the morphing time is longer than the LFO period Instead of this one obtains an interim filter that has a bit of both filters Use other control voltage sources e g LFO ADSR Random CV to control the parameters of the A 107 by external voltages morphing time filter frequency filter resonance amplitude O Extend the filter chain by adding filters to step 03 04 05 and try different filter types in the chain Now you should experiment with a real filter chain so far only two filters were used and try more sophistica ted controls O Extend the filter chain by adding new filters to step 03 04 05 and try different filter types in the chain You may also use the factory setting of the chains step 1 filter 2 step 2 filter 2 QHEP FER O Try differen
13. is reached the next clock switches back to step 1 of the chain Addressing the filters of the chain in the working buffer can also be controlled by the manual step control and or an external control voltage at one of the Step CV inputs According to the manual setting and the external voltage s the corresponding filter within the chain is addressed For both the clocked and CV addressed mode the transition time between succeeding filters can be con trolled manually by the Morphing control and or an external control voltage at one of the Morphing CV inputs Attention CV addressing overruns the filter selected in the clocked mode All parameters can be controlled resp modulated by different voltages at the same time filter step mor phing time filter frequency resonance and amplifi cation A 107 Multitype Morphing Filter System A 100 QOEPFER 3 Overview A 107 Multitype Morphing Filter CV2 Altenualer CV2 Kess Mote gt No Dirwlay Mode Step Piko Chainy Prg C pak OOEPFER JUEPFEA Programming Unit Controls Display 3 digit LED display Step button calls up display mode Step Filter button calls up display mode Filter Chain button calls up display mode Chain Prog button calls up display mode Prog Value rotary encoder to set the value for Step Filter and Chain Step two CV inputs with without attenuator
14. lters within a chain only filters from the same group have to be used If two succeeding filters are from different groups a short click will be heard as capacitors have to be switched between the filter groups Of course this characteristic can be used intentionally for special effects System A 100 Multitype Morphing Filter A 107 o How to program a filter chain Make sure that no external control signals are fed into the inputs Step CV Step Clock and Step Reset These signals would disturb the pro gramming procedure as they change the current step within the chain 0 g IS Operate the Step button and select the desired step e g S01 within the current filter chain working buffer by using the value control Operate the Filter button and select the desired filter type e g F13 for the current step by using the value control Select the next step e g S02 by operating the Step button and assign the filter type for this step as described above Continue until all steps are programmed It is not necessary to program all 32 steps of a chain If you e g want only 5 different filters you may only program the steps 1 5 But you have to pay attention that only these programmed steps are addressed later e g by the external CV use the attenuated CV input If you want to keep the chain in the working buffer before you modify the settings you have to store the working
15. t waveforms for the LFO that controls the step CV and increase the effect of the step CV by turning up the attenuator This increases the range of filters that were covered by the LFO CV O Adjust LFO frequency and attenuation manual step and morphing time to obtain a complete pass through the complete chain O By different settings of the manual step control and the step CV attenuator one reaches any position within the chain e g step 16 and varies the range of filters around this position e g 14 16 18 10 16 22 O Any control voltage sources of the A 100 can be used to control the 5 parameters of the A 107 There are no limits to the user s imagination O One may control step CV morphing time filter frequency resonance and amplitude from the CV outputs of a sequencer e g A 155 or MAQ16 3 add a little bit envelop e g from the VC Decay A 142 to control the filter frequency control even the decay from a sequencer track and you will discover filter sequences you never heard before O The voltage controlled polarizer A 133 is a suitable tool to adjust envelopes dependent on the current filter tyoe A LP with a low basic frequency requires another envelope normally positive than a HP e g a negative envelope The A 133 is very useful to change the envelope polarity and level indivi dually for each filter within a sequence System A 100 Multitype Morphing Filter A 107 7 Filter types The 36 filter
16. ter chain are selected one after another Each positive transition of the Clock signal calls up the next filter of the chain A positive trigger at the Step Reset input resets to the filter of the chain that corresponds to the momentary step CV This allows e g to switch bet ween the filters of the currently selected filter chain in sync with a sequencer The filter design is 100 analog CEM filter chip Only the morphing control and memory managing is carried out by a microcontroller Remark Because of technical reasons the transition between the two filter groups cannot be carried out soft as capacitors have to be switched Soft transition i e morphing is possible only between the filters of each group i e within the filters 1 18 or 19 36 Switching between filters causes a click if the filters are from different groups A 107 Multitype Morphing Filter System A 100 QOEPFER Permanent Memory Dis play c01 co2 c64 Audio Out DD D paer NO e LI x wg l T CV2 Z N O O O 0 Amp Ge cvi Chain Prog MEKA be Man Control Unit CV2 Fiter ale S Fitter Fea piae ov SEEE gt Unit D Man Step ve SO S31 S32 Se Eer EE e wv Te Ay A i kat
17. ter types described in chapter 7 Take the time to hear all the filters and how they respond to filter frequency reso nance and distortion Find out how morphing between 2 filters is influenced by the morphing time Differences in loudness can be compen sated with the amplitude control The easiest application is to use only one single filter from the pool of 38 filters This makes quite sense as there are a lot of filters available that cannot be reali zed with other A 100 modules e g the fast food filter no 09 look at response curve to understand the name fast food But the point of the A 107 are of course the filter chains and the morphing features In the following we describe some suggestions FER System A 100 Multitype Morphing Filter A 107 Clocked mode The advance to the next filter in the chain can be triggered by different events Here some examples e Advance triggered by a keyboard by using the gate signal as step clock e Advance triggered by manually operated control devices like foot switches A 177 Theremin gate output of the A 178 light controller gate output of the A 179 ribbon controller gate out put of the A 198 e Random advance with the Random Clock Genera tor A 117 or A 149 2 or via CV with the A 118 random CV output or one of the outputs of A 149 1 e Periodical advance with the rectangle output of a LFO any clock signal or in sync with MIDI clock clock out of the A 190 divided by th
18. types of the A 107 are shown on the next pages For each filter the frequency response curve X frequency versus Y amplitude is shown and a short comment is added For some filters customary names are available e g xxdB lowpass highpass bandpass notch or allpass For the new filters without customary names we tried to find an explanation that describes the filter as good as possible The filters are divided into two groups The filters of the first group 01 18 allow self oscillation The filters of the second group 19 36 do not include this feature 15 A 107 Multitype Morphing Filter System A 100 QOEPFER 24 dB Lowpass 12 dB Lowpass Bandpass Asymmetric Bandpass 1 6 dB LP 6 dB HP 12 dB LP 6 dB HP Asymmetric Bandpass 2 Bandpass Notch 6 dB Lowpass Allpass 6 dB Lowpass 18 dB LP 6 dB HP 12 dB LP 12 dB HP 09 12 2 Bandpasses separated by a Lowpass shifted Bandpass Lowpass Notch Tooth notch fast food filter 2 shifted Bandpasses 16 A 100 Multitype Morphing Filter A 107 Lowpass 2 shifted Bandpas 2 shifted Bandpasses with dif Lowpass Notch Highpass Lowpass Notch II ses with different amplitudes ferent amplitudes Lowpass Soft Notch Band Lowpass with shifted Band 18 dB Lowpass 6 dB Lowpass pass pass smaller amplitude 6 dB Highpass 12 dB Highpass 18 dB Highpass Asymmetric Bandpass 3 12 dB LP 6 dB HP 17 A 107 Multitype Morphing Filter System A 100 Q
19. voltage e g from a LFO or ADSR the control voltage has to be patched into one of the two frequency control inputs One input is equipped with an attenuator to control the frequency modulation amount of the corresponding input System A 100 Multitype Morphing Filter A 107 The effect of filter frequency depends upon the filter type that is selected with the programming unit In case of a lowpass or high pass it is the cut off fre quency for a bandpass or notch it is the middle frequency More details can be found in the manuals of other A 100 filters e g A 121 A 123 A 124 A 108 A 105 122 Resonance This group of controls serves to define the filter reso nance emphasis It contains a manual resonance control and two resonance CV inputs one with at tenuator one without attenuator The filter resonance is manually adjusted with the manual resonance control To modulate the resonance by an external voltage the control voltage has to be patched into one of the two resonance control in puts One input is equipped with an attenuator to control the resonance modulation amount of the corre sponding input According to the selected filter type the resonance effect emphasizes the frequencies around the cut off frequency lowpass highpass or alters the bandwidth bandpass notch For the new filters without names 11 A 107 Multitype Morphing Filter normally one of the frequency peaks shown in the response curves
20. y while the morphing is in progress The blinking fre quency is an approximate measure for the morphing time As soon as the new filter type is reached both points turn off System A 100 DHE PPE The right decimal point is a warning indicator for the functions CHAIN and PRG and is blinking as soon the button or is operated see below Step Operating this button calls up the display mode that shows the current step of the chain in the working buffer There are different was to select another step within the chain Operate the Value control Operate the manual Step control see Altering one of the the Step CVs see Feeding a Clock signal to socket The first two items relate to manually controlled steps The two last items correspond to voltage resp clock controlled step addressing and are suitable for auto matic filter addressing and morphing e g controlled by a LFO ADSR random CV Theremin ribbon foot controller MIDI to CV or a sequencer QHEP FER Filter Operating this button calls up the display mode that shows the filter type of the currently selected step of the chain in the display To select another filter type the Value control has to be operated A detailed list of all filter types with frequency response curves is available in chapter 7 IS The filters are organized in two filter groups with 18 filters each To obtain a continuous morphing soft transition for all fi
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