A-155 (Analog / Trigger Sequencer)
Contents
1. fig 5 controlling accents dynamics With the patch in fig 5 you can create variable dyna mics or accents within the sequence The gain con trol of VCA 2 needs to be set to greater than zero a setting of 5 is a good starting point 12 V VCO VCF p VCA 2 gt P f The patch in fig 6 shows how to use the A 155 as a 16 step sequencer with one single analog CV row What s needed are the Clock Divider A 160 output 8 and the two voltage controlled swit ches in the A 150 VCS module With every eight clock pulses the A 150 switches between the two trigger and analog CV rows so that there s now a 16 step trigger and CV sequence avai lable at the outputs of the A 150 System A 100 Analog Trigger Sequencer A 155 Clock Trig In A 155 ji s a J s Trig 1 A 150 mn n c Eo Trig 3 4 w cv e yd e W Ww lw y Post Out 1 Jp 1 0 1 Post Out 2 o oll _ h gt Trig Out A 150 INTI LI p CV Trig 1 Trig 3 01 mong oll fig 6 16 step sequence with single analog CVs 13 A 155 Analog Trigger Sequencer System A 100 QOEPFER The following are some short notes with suggestions for further exploration to act as inspiration for your own patching ideas 14 Gate patched to glide control Glide portamento can be switched on or off for each step a la TB 303 see p 6 Trig2. chosen because the glide function is being used DUEPFER Trigger row 1 steps 1 2 3 and 5 selected picks out the accented notes by triggering an ADSR which controls the VCA Trigger row 2 determines the length of the se quence by triggering the reset function In this example step seven is switched to this row which is patched to the reset input making the sequence six notes long The gate row is used for controlling the glide func tion In this example step two is switched to this row so that portamento at a rate set by the Glide control occurs between the voltages at step one and step two The lower analog CV row is controlling the VCF cut off frequency Trigger row 3 is available for any other control job you choose Variations on the patch in fig 3 might include controlling the VCF with either the same or a different ADSR or using the lower analog CV row to control the decay time of a VC ADSR see also fig 4 Interesting effects can be obtained by patching exter nal control voltages e g from an LFO or Random CV or audio signals e g VCO or Noise into the lower analog CV row The latter can sound particu larly interesting because of the effects of short bursts of audio range frequency modulation System A 100 Analog Trigger Sequencer A 155 Interesting effects can be obtained by patching exter nal control voltages e g from an LFO or Random CV or audio signals e g VCO or Noise into the lower an
3. or neither of the two triggers works Each row has an LED which lights whenever a trigger or gate is active at any particular step A 155 Analog Trigger Sequencer System A 100 QUEPFER g gg q 2 Overview A 155 Analog Trigger Sequencer Trigger Outputs ontrol 1 2 3 4 5 6 7 8 Trig TA ee Start Control o Py 6 6 6 6 6 6 6 T es Trig 2 y y PX Step 6 6 T Gate A Pe Reset o o 200000000 0 o 7 10 0 10 0 10 002100 Cie Clam WIT wm a wy AN 0 10 Z Range Glide 4 PS S S A N o Ctrl o Ctrl o 2 i Glide i o out o Out Cc External CV Audio Inputs 4 6 DUHEFPFEH Controls Switches LEDs Trig Control CV knob CV knob Range Scale Glide Control Start Stop Step Reset System A 100 Analog Trigger Sequencer A 155 these select triggers and or gates for each step indicators to show the step reached indicators for trigger and gate rows these set the control voltage output for each step of the upper CV row these set the control voltage output for each step of the lower CV row and or act as attenuators for the ex ternal CV audio inputs switch to select the voltage range of the CVs put out by the upper CV row range control for the lower CV row control for the glide time amount of slew on either upper or lower CV row
4. sensed the analog CV output is held at the same level until the control si gnal goes low Usually one of the trig ger rows would be patched in to this socket MH The purpose of this hold function becomes clear if you e g want to hold the pitch of a VCO over 2 or more steps In this case the S amp H function takes care that the CV is held over the regarding steps provided that the S amp H control input is connected to one of the trigger outputs and the trigger switches are set suitable Without the use of the S amp H you would have to adjust the potentiometers of the regarding steps very careful to obtain exactly the same voltage for the successive steps System A 100 External CV Audio Inputs The inputs 9 for the lower analog CV row can be used to patch in any control voltage or audio signal For any step used in this way the CV knob 6 then acts as an attenuator for the signal input 5 User examples Module A 155 has limitless potential All sorts of very complex seguences modulation and audio manipula tion are possible In the following examples of typical patches there s only room to mention a few of the most common uses Fig 3 shows a standard patch a six step seguence with pitch filter and glide control to give an example of some of the typical control possibilities the A 155 provides The upper analog CV row is controlling the pitch of the VCO In this example output Post Out 1 has been
5. 1 Introduction Module A 155 Analog Trigger Sequencer is a com bined 8 step analog and trigger sequencer it can simultaneously produce sequences of analog voltages and trigger and or gate signals Module A 155 works very much like the Clock Sequen cer module A 161 but includes many extra and expensive to implement functions The control section includes switches for Start Stop Step and Reset which can be operated by push button as well as digital signals Above the top row eight LEDs show the progress of the sequence with each step s LED lighting in turn The A 155 has two analog rows each with eight knobs with which to set the control voltage for each step The upper row is particularly designed for pitch control of a VCO with a range switch giving the ability to set pitches precisely System A 100 Analog Trigger Sequencer A 155 The lower row of eight knobs has the ability to accept an external signal for each step in which case the knobs act as attenuators for this voltage The variable voltages from the analog rows can either be output direct or can go through a sample and hold section and a slew limiter glide Using the S amp H and glide control inputs it s possible to select hold S amp H or portamento glide for whichever step or steps you want Three rows of triggers and one row of gates are available For each step a three way mini switch lets you decide whether one or the other
6. alog CV row The latter can sound particu larly interesting because of the effects of short bursts of audio range frequency modulation A 155 Analog Trigger Sequencer System A 100 QOEPFER Clock fa e A 155 Reset 1 2 3 4 H H H Trig 1 Ho Trig 2 Trig 3 m H Gate Glide Ctrl S amp H Crtl 1 Post Out 1 I I 4 1 I I lt I Pre Out 2 fig 3 standard patch with VCO VCF and glide control 10 System A 100 Analog Trigger Sequencer A 155 Clock A 155 1 2 3 4 6 7 8 mam E LEH Trig 1 HEHE HE H H H HH WWWWYW VW DY Postout1 VCO VCF Ww 4 4 e x Ww WM e Pre Out 2 VC ADSR Decay N N fig 4 controlling decay time in a VC ADSR In fig 4 the lower analog CV row controls the decay time of a VC ADSR This in turn controls the cut off frequency of a VCF and so produces filter accents of different lengths 11 A 155 Analog Trigger Sequencer System A 100 SNG VAL Ny Clock A 155 ADSR 1 2 3 4 5 6 7 8 E HE H ju mi m E Trig 1 Trig 3 nm m m E E u 9 4 MP T Post Out 1 e e e e Pre Out 2
7. ger Gate patched to Reset Shortening a sequence to e g six notes Trigger Gate patched to Stop One shot the sequence runs just once and only repeats when a Start signal is received Chopping up audio signals Using the lower analog CV row audio signals patched into the inputs will be output chopped up from the Pre Out socket MIDI control The A 155 can be controlled by MIDI Clock with the help of an A 190 module the Clock and Reset outputs of the A 190 are simply connected to the Clock and Reset inputs on the A 155 e Random Clock The Random Clock output from the A 117 can give a sequence random timing e VC LFO as Clock Using one of the analog CV rows to control a VC LFO A 147 the timing of each step of the sequence can be completely variable e Variable decay time for each step Using one analog CV row to control the decay time on a VC ADSR A 141 or A 142 and on the A 141 attack and release times could also be controlled the envelope output can then control e g a VCF or VCA e Variable audio pulse width for each step Using one analog CV row to control the pulse width of a VCO square wave Variable control pulse width for each step Using one analog CV row to control decay on an A 142 and taking the gate output from the A 142 DIEPFER System A 100 Analog Trigger Sequencer A 155 6 Patch Sheet The following diagram of the module can help you recall your own Patches It s designed so tha
8. manual controls start button stop button button for manually stepping through a sequence reset button In Outputs O Trigger Out Control Start Stop Step Reset outputs for the three triggers and one gate digital control input sockets input for start signal input for stop signal input for clock signal input for reset signal CV outputs control inputs Pre Out Post Out S amp H Ctrl Glide Ctrl O External CV Audio Inputs output for the upper or lower analo gue CV row as above but after the sample and hold and or glide circuitry control input for sample and hold section control input for the glide section inputs for controlling the voltage of each step of the lower analog CV row by a CV or audio signal A 155 Analog Trigger Sequencer 3 Controls Switches The three position toggle switches are used to select whether a particular step outputs a trigger signal on its respective row Position of the upper switches e up trigger output on row 1 Trig 1 output e centre no trigger output e down trigger output on row 2 Trig 2 output Position of the lower switches e up trigger output on row 3 Trig 3 output e centre no trigger output e down gate output on row 4 Gate output The three upper rows produce triggers each step that is switched to a row will produce a short pulse like a clock signal The lowest row produces gates the
9. o input socket the corresponding knob in the lower row doesn t put out its own voltage Instead it acts as an attenuator for the external CV audio signal before sending it to the lower Pre Out output System A 100 Analog Trigger Sequencer A 155 Range The position of the Range switch a three way toggle switch selects the precise voltage control range within which the upper row of CV knobs will operate There are three ranges to choose from e up 1V i e one octave e centre 2V i e two octaves e down 4V i e four octaves The maximum voltage is obtained by turning the knobs fully clockwise Scale Control sets the range of control voltages within which the lower row of CV knobs 6 will operate If an external CV audio signal is patched into any of the sockets O the scale control affects the amount of attenuation the CV knob will produce on that voltage Glide The internal slew limiter s rate is set with control amp If for the current step in a sequence e g step three the slew limiter is switched in by a low control signal at the Glide Ctrl 6 socket the control voltage sent to output Post Out 6 doesn t jump instantly from the voltage at the previous step in this example step two Instead it glides gradually to the new voltage at 5 A 155 Analog Trigger Sequencer System A 100 QOEPFER a speed determined by the Glide control knob fig 2 If you patch the outpu
10. sends the sequence back to step one IS Start and Stop inputs work in trigger mode As soon as they sense the rising edge of a pulse they produce a momentary signal The length of the pulse makes no difference a pulse of long duration still just produces a momentary trigger System A 100 Analog Trigger Sequencer A 155 Clock step and Reset inputs on the other hand work by sensing level so for instance Reset will always be active keeping the sequence at step one as long as the reset signal is high CV outputs control inputs The two groups of sockets contain the analog CV outputs for each row and the digital control inputs for the sample and hold and slew limiter sections The upper group of sockets relates to analog CV row 1 and the lower to analog CV row 2 Pre Out The control voltages set on the respective analog CV row are output here before pre passing through the slew limiter and sample and hold sec tions Post Out The control voltages set on the respective analog CV row are output here after post passing through the slew limiter and sample and hold sec tions A 155 Analog Trigger Sequencer Glide Ctrl The glide function is active whenever the control signal input here is low ms If nothing s connected to the socket glide function is active e S amp H Ctrl This is the socket for the digital Sample amp Hold control input Whenever a high control signal is
11. signal remains high for the duration of the step see fig 1 on the next page O LEDs The eight LEDs show the sequence s progress each LED lights when its respective step is active System A 100 1 2 3 4 5 6 7 8 Trig 17 HM m E E H 7 E m H Trig 2 7 Trig 3 T Gate 7 H E E H H Clock Trig 1 m m m m m mm ad JA RS AA fig 1 timing diagram for trigger and gate rows Trig Control The four LEDs are status indicators for the trigger and gate rows Each lights when a step is reached which is switched to its own row DUEPFER CV knobs upper row You use the CV knobs upper row to set the voltage output for each step in the upper analog CV row The control voltage set for each step is output at the upper Pre Out 6 socket The range of voltage output can be controlled with the range switch Three very accurate voltage ran ges are provided see below so that the upper analog CV row is ideally suited for precise VCO pitch control CV knobs lower row You use the CV knobs lower row to set the voltage output for each step in the lower analog CV row The control voltage set for each step is output at the lower Pre Out socket You use the Scale control to adjust the range of the voltages controlled by the CV knobs IT If for any step you patch in an external CV audi
12. t a com plete 19 rack of modules will fit onto an A4 sheet of paper Photocopy this page and cut out the pictures of this and your other modules You can then stick them onto another piece of paper and create a diagram of your own system Make multiple copies of your composite diagram and use them for remembering good patches and set ups lt Draw in patchleads with colored pens Draw or write control settings in the little white circles 15 A 155 Analog Trigger Sequencer System A 100 A 155 Analog Trigger Sequencer Trigger Outputs Control 1 2 3 4 5 6 7 8 Trig AL S s Control o e Meh a _ Stop ne 6 Trig 2 P Step Trig 3 e eo O Gate P Reset o 09 1v ran Pre Post 2V 8 Out o Out 0 10 0 10 0 10 0 T oO 10 0 10 0 10 0 10 aM Range Glide AN Sa a 7 ide 7 o Ctrl Ctrl NN A SS A S A git P p Post 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 1 10 0 6 O out Scale Glide e J o e J o o o ex ca Bs External CV Audio Inputs 16
13. t from the Gate row into the Glide Ctrl input you can switch the glide func tion on or off for each step like on the Roland TB 303 see fig 2 If you patch the gate output through an A 165 trigger modifier every gate activates glide Trig 3 Gate 7 Clock Gate Pre Out LA VI N fig 2 glide function Post Out Control The control section includes four push buttons for manual sequencer control Alternatively digital control signals can be sent to four corresponding sockets Start Used to start the sequence i e to set it running Stop Used to stop the sequence Step Used to step through the sequence one step at a time Each button press corre sponds to a clock pulse Reset Used to reset the sequence i e to send it back to begin again at step one 4 In Outputs O Trigger Outputs Sockets are the outputs from the three trigger rows and the gate row Control Alongside the four buttons for sequencer control there are four corresponding digital control input sockets 6 Start Stop A signal here starts the sequence A signal here stops the sequence Clock A clock signal here steps through the sequence Also called step input e Reset A signal here
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