4ms PEG Podręcznik użytkownika - Strona 11

Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Sprzęt muzyczny 4ms PEG. 4ms PEG 12 stron. Pingable envelope generator, eurorack module

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%

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(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,

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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

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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

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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

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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

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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.

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