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Feedback Send/Return block

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Feedback Send/Return: supported by which Fractal Audio products

Feedback Send/Return: X/Y switching or channels

Feedback Send/Return in the Axe-Fx III

The Axe-Fx III has two sets of Feedback Send/Return blocks, a much-requested feature.

Feedback Send/Return settings

Axe-Fx II: Both blocks have parameters which need configuring. In most cases you'll want Send to feed the Return block only, not to pass signal to the next block. So Send Level (signal to Return) has to be at 100% and Output Level (signal to next grid block) stays at zero. In this case the Return block's Mix parameter (signal from Send) should be 100% and Return Level (signal to next grid block) is 0 dB.

Axe-Fx III: Feedback Send does not have parameters anymore. The signal to Feedback Return can be controlled with Mix in the Feedback Return block. And if the signal is passed to the next block and needs adjustment, there are other tools to accomplish that, such as a Volume block.

Using Feedback Send/Return

Extend the signal chain on the grid

You can use Feedback Send/Return to connect the signal chain on the grid from one row to another. The manual explains how this works.

Combine FX Loop and Feedback Send/Return to send Input 2 to Output 2 (Axe-Fx II only)

Feedback Send and Return can be used to enhance the FX Loop block in the Axe-Fx II. By itself FX Loop enables:

By placing FX Loop inbetween Feedback Return and Feedback Send, you can accomplish both: send input from Input 2 to Output 2. Read this: FX Loop block.

Create a delay loop

Create a delay feedback loop.


Protection against feedback runaway

"The feedback return will clip at extremely high input levels. This is a protection mechanism to prevent against "runaway" if someone creates a feedback loop. The feedback return clips at a level of 38 dBu. This is nearly 10 times the maximum output level of the unit. If this protection were not there a feedback loop could be created that would result in digital overflow and cause a reboot." source
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