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The  filter  envelope  shapes  the  timbre  and 
overtone content of the audio signal as it passes 
through  the  modifying  circuitry  from  the  mixer. 
This envelope or "contour" generator is used to 
dynamically move the cutoff frequency. It works 
as  such:  each  time  a  key  is  depressed  an 
envelope or "contour” generator attached to the 
filter's cutoff frequency is actuated, and sends a 
control  signal  to  the  filter.  The  control  signal 
rises at one rate, falls at a second rate, levels off 
at  a  certain  level,  and  then  finally  falls  off  at  a 
third rate. These four parameters and their effect 
upon the cutoff frequency are explained below. 
 

What the Switch pads do: 
 

Selects  the  attack  time.  The  attack  time  determines  the  initial  segment  of  the 
envelope. The frequency at which the contour begins is determined by the filter 
frequency setting, while the peak,  which  it  reaches, is determined by the  filter 
frequency  and  Envelope  1  amount  settings  combined.  Incrementing  the  value 
from 

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-

  127

  127 will result in the brightness of the sound increasing sharply at first, 

and then more gradually as the attack time lengthens. 
 
Selects the decay time. The decay time determines the duration of the second 
segment of the envelope, i.e., the fall from the attack peak to the sustain level. 
While repeatedly depressing a key and incrementing the value from 

-

-

 127

 127 you 

will at first hear the brightness drop sharply after the initial attack; the drop will 
become more gradual as the decay time lengthens. 
 
Selects  the  sustain  level.  The  sustain  level  determines  the  filter  frequency  at 
which the envelope "levels off" after the initial rise and fall. The frequency of the 
sustain level can be as high as the initial peak, in which case there is no decay 
after the initial rise, or it can be as low as the frequency at which the envelope 
contour began.   
 
Selects  the  release  time  and  is  the  fourth  and  final  stage  of  the  envelope 
contour. Finally, after the initial rise and fall of the attack and decay times to the 
sustain level, the release time takes effect after the sustain level segment, when 
the played key or note is lifted. The frequency at which the sustain level is set, 
falls to the initial filter cutoff frequency level at the rate set by the release time. 
 
 
 

ENVELOPES 

continued on next page.

 

 
 

Summary of Contents for ATC-X

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Page 3: ...USING THE MEMBRANE AND ROTARY ENCODER reading the display 5 CREATING SOUN DS OSCILLATORS 6 7 FILTER 8 ENVELOPES 9 10 11 MODULATION 12 12b MIDI KYBD 13 14 PROGRAM editing and saving patches 15 TECHN I...

Page 4: ...l input for audio signal processing XIV Ringmod Hardware A Two voltage controlled oscillators with triangle sawtooth and square waveforms The square waveform has variable pulse width control B User se...

Page 5: ...any kind benzene paint thinner propyl alcohol etc to avoid the risk of nasty discoloration disfigurement and most importantly those deadly liver flukes It should be parenthetically noted that neither...

Page 6: ...s unique features and functions allowing the discerning musician complex tone manipulation and seemingly endless patch variations The electronically produced sound of the ATC X is vibrant warm and pun...

Page 7: ...minutes for proper warm up to assure tuning stabilization D Enjoy the negative space that is the balance of this page Well almost A 450 dpi print quality version of the Cover page is available for roy...

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Page 9: ...ich turns smoothly in either direction for complete control After a switch pad is pressed you will use the encoder in almost all operations to edit or change any desired function or parameter Edits to...

Page 10: ...e for both oscillators Selects the sawtooth waveform Press once to display current patch setting then press again to turn on or off Sawtooth shaped waveforms produce punchy brass like tones same for b...

Page 11: ...if the filter frequency is set too low In lieu of Noise press the noise dist noise dist button once to see which function is currently selected press again to toggle to the other function Set the Nois...

Page 12: ...rmonics more apparent The MINI and 2600 filters will begin to self oscillate and may be used as a separate tone source when the resonance value passes 100 100 Selects the filter tracking amount Filter...

Page 13: ...arply at first and then more gradually as the attack time lengthens Selects the decay time The decay time determines the duration of the second segment of the envelope i e the fall from the attack pea...

Page 14: ...different qualities as you increase from a short sharp attack to a long slow crescendo Selects the decay time The decay time determines the duration of the drop in volume from the initial peak to the...

Page 15: ...emains until the note or key is lifted then the release if any determines the rate at which the sustain level falls to the initial level NOTE pressing the decay switch pad a second time accesses the r...

Page 16: ...and selecting the up or down start point of the LFO wave cycle To select the sound source or parameter to be modulated by the LFO press the target target switch pad see page 15 for the LFO assignment...

Page 17: ...the QUICK REFERENCE GUIDE sheet for waveform number definitions Void below vintage NAMM Show banner reserved for doodling grease stains and sectional integrity by mercurial order of the Knights Regis...

Page 18: ...a time see page 16 for the complete assignment list Selects the Aftertouch assignment and its sensitivity Press once to access the assignment list press again to access the sensitivity amount Only on...

Page 19: ...will override glide First press glide on off Second press regular mode or legato mode notes will only glide if legato notes are played Third press glide rate Fourth press Auto glide interval Note with...

Page 20: ...h you wish to return to the Patch Number Display Mode press the exit bank exit bank switch pad To Compare an edited patch After a patch has been edited press and hold exit bank exit bank then press sa...

Page 21: ...ction button 74 X mod amnt 84 Env 3 amnt 85 Env 3 attack 86 Env 3 decay 87 Env 3 sustain 88 Env 3 release 89 Filter tracking 90 Osc 2 fine tune 102 Mix 1 103 Mix 2 104 Mix noise 105 VCF freq 106 VCF r...

Page 22: ...127 Velocity Note ON Note OFF X X 09n V 127 X After Touch Key s Ch s X X O O Pitch Bend Control Change see chart pg 15 Basic Channel Program Change True X 0 127 System Exclusive O O System Common Son...

Page 23: ...rrect ii Is the filter cartridge properly inserted iii Is the volume of the ATC X turned up iv Are the MIDI channel settings correct The pitch is wrong i Is the master tuning setting correct ii Are th...

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