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Phase Shifting

Variable phase shift – two sets of events are repeatedly occurring at the same intervals, but the amount of 
stagger between them is variable.

Ping both sides with the same clock. Cycle on (both channels). Main envelope outputs to open two different 
filters or LPG's or somehow make sound. 

Some options for setting the amount of phase difference:

•

Manual trigger into Async jack on one channel

. For example, to set the blue channel to lag by 25% 

(90° phase difference), hit the trigger a quarter of the way after a red channel pulse.

•

CV Skew

. Changing the skew will change the timing that the peak of the envelope occurs. Thus, 

sweeping the Skew of one channel while holding the other steady will cause the envelope peak to shift 
in phase with respect to the other envelope's peak.

•

Quantized

 

phase selection

. Slow each channel down to /8. Speed your clock up if necessary. Turn 

blue channel cycle off. Listen to the red channel and at a moment right before you want the blue channel 
to come in, press the Cycle button on. The blue channel's phase will be quantized to one of 8 possible 
phases (0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315°). It helps to set a sharp attack on the red channel 
(Skew at 100%) so you can hear the timing better. Cycle button can be turned off and back on to change 
phase again.

Use different Div settings for different possible phase shift amounts (e.g. /7 gives 0°, 51°, 102°. etc...)

Quadrature patch

First, you have to set up the phase difference between the two channels:

•

The easy way

: Clock both channels with the same clock and patch the blue channel Half-R into red 

channel Async. Turn blue Cycle on and red Cycle off. Adjusting the Skew of the blue channel will change 
the amount of phase shift from 0-180° (50% skew will be 90°). 

Note: If you set red Skew to more than 

50%, this technique will result in a trapezoidal waveform, which may not be desired. To overcome this, 
turn the red channel to Cycle mode, wait for one cycle, then unplug the Half-Rise->Async patch cable. 
Another way to overcome this is to run the Half-R output through a trigger to gate module before going 
into Async.

•

Another way, just for kicks:

 Clock both channels together and set both to /4. Using the same 

technique as described in the 

Quantized phase selection

 patch above, hit the Cycle button at the right 

moment so that one channel is 90 degrees out of phase as the other. Or, turn blue Skew one mark to the 
right of center, turn red Cycle off, wait for red envelope to finish, wait for the blue Half-R LED to go off, 
and immediately patch blue Half-R into red QNT. The two channels will be 90 degrees out of phase.

Now adjust the levels:

•

Turn both Scale knobs to Invert (about 10:00) and both Bi-polar buttons on. Run the main ENV outputs 
into a Level Shifter (e.b. Bubblesound LvL+rm or Doepfer A-129/3) to add about 2.5V so that the 
inverted signals are at the same DC offset as the +5V ENV outputs. Your four phase shifted outputs will 
be Blue +5V ENV (0°), Red +5V ENV (90°), Blue level-shifted ENV (180°), Red level-shifted ENV (270°).

If you use this patch often and want to avoid using an external level shifter module, you can adjust the Bi-Polar 
trim pot as described in the Bi-Polar section above. 

Page 11

Содержание PEG

Страница 1: ...rator whose envelope lengths are set by incoming clocks or pings The PEG has full CV control of envelope shape skew and ping clock division multiplication as well as a plethora of triggering and cycling options AD AR quantization cycle cycle toggle and a tap tempo button for each channel DOWNLOAD UPDATED MANUAL AT http 4mspedals com peg php ...

Страница 2: ...goes high when envelope finishes a fall portion and goes low when envelope begins a fall portion Half R Half Rise gate goes high when 50 of the time of the rise portion has elapsed and goes low after 50 of the time of the fall portion this is different than a voltage comparator based design Jumper for each channel changes EOR output to a Half Rise gate output Factory setting is EOR for red channel...

Страница 3: ...s a clock output from an RCD SCM Step 4 Adjust your output level Adjust the Scale knob and or play with the Bi polar button to get a good voltage range that works well with whatever you re modulating with the PEG That s the basic PEG patch Ping Trigger and Output Now we can play with the parameters of the envelope Step 5 Set up your Division Multiplication amount Turn the Ping Div Mult knob to var...

Страница 4: ... clear an externally generated ping if the external unit has stopped sending pulses 2 External Clock plug a clock or manual trigger module into the Ping jack Only the timing between the last two pulses is used to set the ping clock timing no averaging Therefore you can plug in a manual trigger gate module such as the Pressure Points and just tap in two pulses the ping clock will continue to run at...

Страница 5: ...k will force an update of the div mult amount immediately in the middle of a curve if necessary If you hold a gate high on the QNT jack the div mult amount will track the CV glitchy envelope shapes can be obtained this way See Figure 1B When the Div Mult amount changes the PEG has to compensate the envelope in order to maintain timing A partial envelope may be generated after the div mult amount c...

Страница 6: ...n start the fall curve once the gate is released A S R envelope See Figure 5 4 T jack Cycle Toggle When a gate is appled to this jack both channel s Cycle buttons will toggle state on off and off on When the gate is released they will revert to their previous state The T jack is useful for toggling between the two channels set one channel in Cycle mode and the other channel to non cycling and take...

Страница 7: ...inear rise linear fall or asymmetrical e g exp rise log fall See figures 8a 8d The curve is selected from one of 17 using the Curve knob and CV jack the knob sets the offset for any applied CV As you turn the knob clockwise the first 4 curves are asymmetrical with exponential attacks and varying decays The last 4 curves are asymmetrical with logarithmic attacks and varying decays The middle 9 curv...

Страница 8: ...pot One common use would be to set this to about 10V of level shift so that the output when Scale is inverting would be positive voltages but with an inverted waveshape This is useful because now the 5V ENV jack and main ENV jacks will produce inverted copies of the same waveshape but in the same voltage range The main output is the ENV output and its amplitude is controlled by the Scale knob and ...

Страница 9: ... has elapsed It goes low when 50 of the fall time has elapsed It is high during a sustain segment and stays low when the envelope is not running While the Curve and Scale parameters have no effect on the gate outputs Skew has a big effect Skew changes the pulse width of EOF and EOR Turning Skew to the right more CV creates longer EOR pulses and shorter EOF pulses To the left we get shorter EOR and...

Страница 10: ...steps 1 7 to 0V output and step 8 to 5V If you want to control the number of times the note repeats e g 8 times as fast but only hit 4 times you can use a sequencer with variable pulse width for its gate output patched into the QNT jack or another module to change the pulse width e g Seq Gate SCM In and SCM x1 PEG QNT playing with SCM s PW knob Self oscillation self patched Very chaotic interestin...

Страница 11: ...y way Clock both channels with the same clock and patch the blue channel Half R into red channel Async Turn blue Cycle on and red Cycle off Adjusting the Skew of the blue channel will change the amount of phase shift from 0 180 50 skew will be 90 Note If you set red Skew to more than 50 this technique will result in a trapezoidal waveform which may not be desired To overcome this turn the red chan...

Страница 12: ...with 5V Source jumper selecting external 5V 105mA max with 5V Source jumper selecting internal 5V 5V rail 40mA max with 5V Source jumper selecting external 5V not used with 5V Source jumper selecting internal 5V 12V rail 35mA max Page 12 ...

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