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Signal Routing: Using Send and Return
The Send and Return jacks are simple but offer a wealth of possibilities for creative patching. The
Send jack simply carries the delayed signal, unmixed with the input. It's the same as the main Audio
Out jack if the Mix control is set fully clockwise. The Return input is summed with the main In.
However, it does not appear in the "dry" signal and is not attenuated by the Delay Feed knob and CV.
Feedback with External Processing
The classic use of Send and Return in a delay effect is to modify the delayed signal before it is
returned to the mix. Probably the most popular application of this kind of side-chain processing is a
simple low-pass filter in the feedback path. This causes succeeding repeats to soften, with less high-
frequency content on each pass. This is similar to the behavior of echoes in an acoustic environment,
and for this reason a low-pass filter is included in the internal feedback path of many conventional
delay processors. Note that the first echo will not be processed by the external effect, only the second
and subsequent echoes will go through the Send/Return path.
In patches involving externally processed feedback, the gain of the processing chain is always a
concern. In the case of filters in particular, the gain may be suitable overall, but not at the frequencies
you want to recirculate. If the filter is resonant, runaway feedback may occur even when the overall
gain is low.
Advanced Usage
Loop start and stop points: Trimming the loop
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memory. If you want to move more quickly than an "inchworm", try windowing: see the Windowing
Section below.
Windowing (aka Scrolling or Scrubbing)
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and stop points of the loop to scroll forward or backwards, depending on which way you turn the
Feedback knob. The amount of scroll is determined by how you turn Feedback: one full turn of the
knob equals one loop length. So if you have a 2 second loop, then turning Feedback from 0% to 100%
will shift the loop forward by two seconds. Turning Feedback from 100% to 50% will scroll the loop
backwards by one second.
Note: Windowing only works when Inf. Hold mode is on.
Windowing Tutorial
Let's try it. First get set up: Set Time so you have a loop length that's a few seconds long. Remember,
the red loop light will flash once per loop. To keep things simple for now, set Feedback low (25 - 50%
perhaps). Play some sounds for 10-20 seconds and then turn on Inf. Hold to lock them in.
When Inf. Hold is on, changing Time will change the loop start point in
order to make the loop the new length. If you hold down the Reverse button
while changing Time, you will change the loop end point. Therefore, you can
change a loop that's 4 beats long into one that's 5 beats long in two different
ways (adding a beat to the end, or to the beginning). There are many
creative possibilities to be explored with adding and subtracting from the
beginning and/or end of a loop. One idea is to "inchworm" up and down
When Inf. Hold is on, the Feedback and Delay Feed parameters have no
meaning since they are effectively at 100% and 0%. However, the
Feedback knob and CV jack have a special purpose when Inf. Hold is on:
Windowing, also known as scrolling or scrubbing.
To use this feature, first makes sure you're in Inf. Hold mode. Then, hold
down the Inf. Hold button while turning Feedback. This will cause the start
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