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Pages A-E are under construction, pages F-Z have been checked and updated

Send and Return blocks

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Extend grid.PNG

Available on which products

  • Axe-Fx III: 2 pairs
  • FM9: 2 pairs
  • FM3: 2 pairs
  • Axe-Fx II: 1 pair
  • FX8: no
  • AX8: no

Channels or X/Y

  • Axe-Fx III and FM9 and FM3: no
  • Axe-Fx II: no

Use to extend the signal chain on the grid

You can use Feedback Send/Return to continue the signal chain on another row. See the picture at the top. The Owner's Manual explains how this works.

Use to send Input 2 to Output 2 on the Axe-Fx II

Feedback Send and Return can be used to enhance the effects loop (FXL) on the Axe-Fx II.

By itself, FX Loop allows:

  • a signal from Input 2 to enter the grid.
  • sending a signal through Output 2.

By placing FXL between Feedback Return and Feedback Send, you can accomplish both: send input from Input 2 to Output 2.

Use to create a feedback loop

Feedback loop.PNG

For an example, search the Factory presets page for "feedback loop".


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

Axe-Fx III, FM9, FM3 – Feedback Send does not have any adjustable parameters. The signal going 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.

The Return block's Level defaults to 0.

"The reason the default level for the Return Block is 0 is probably so that when you insert it, you don't need to fear screaming feedback. The way it is, you can turn it up to make sure you haven't created a bad feedback loop." [1]

"It's a safety thing to prevent unwanted feedback loops." [2]

"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." [3]