feedback effect

[dsad67]

Is there a feedback effect , I can 't find it ?

[gumtown]

There is no specific "Feedbacker" in the GT-100,
 but the closest effect is "Sound Hold" found in FX1 and FX2, and requires an assigned control pedal to activate the hold.

[Hammerhands]

On the GT-001 there is.  It must be on The GT-100, in the Accel FX.

There should be an example in this preset:

P08-2 COMBO LEAD
or
P24-2 FEEDBACK CONTROL
also
P42-2 MidBOOST STACK

There are two modes of feedback, one [OSC] is simulated [you can use it with headphones], the other [NORMAL] needs an amplifier and some volume.

NORMAL:  Analyzes the pitch of the guitar sound being input, and then creates a feedback sound.

[If it is similar to the one on the GT-1000, it does this by creating a high-Q filter.]

OSC:  An artificial feedback sound will be created internally.  When OSC is selected, the effect is activated after a single note is played and the note stabilizes.  A feedback effect is created when the effect switches on; the feedback disappears when the OSC effect switches off.

[gumtown]

And so there is !!
Yes in the ACCEL effects.

[Elantric]

Review the GT-100 Parameter Guide and search " Feedbacker" page 24

https://www.boss.info/global/support/by_product/gt-100/owners_manuals/82060197-53b0-4072-9ce1-0bb5acae3885/

[dsad67]

Found. Thank you all!