Line 6 DL4 Feedback mod

[ilcaccillo]

Hi all,
I would like to modify my DL4 pedal with the feedback mod. Putting a latching Switch to activate and de-activate it,
I've been searching a lot over the internet but cant find information on how to perform it,

the mod is presented in the video, can scroll it to minute 1:50:

http://www.youtube.com/watch?v=-fm9zI12-Pw

Does any one have any info on how to do it? or could you point me in the right direction?

I though about 2 ways of doing that, one is building a feedback loop circuit inside the DL4, something similar to this:
http://experimentalistsanonymous.com/board/index.php?action=dlattach;topic=2855.0;attach=1923;image

The other way could be messing around with the resistance value of the REPEATS Pot  in the DL4, so when the feedback switch is engaged the resistance the circuit sees in the Repeats section is the same as if the knob was turned fully clockwise (or almost fully turned).

What are your thoughs on this?

Thanks

[christonick]

http://www.cubisteffects.com/2009/08/line-6-dl4-delay-modeler-modifications/

Is the best reply I can give ya.  I'm looking to do the same thing, soon. 

[ilcaccillo]

http://www.cubisteffects.com/2009/08/line-6-dl4-delay-modeler-modifications/

Is the best reply I can give ya.  I'm looking to do the same thing, soon. 

Hi christonick,
I know that website and Cubisteffects services, were you telling me that I could buy that service? or just wanted to show me the description of Cubisteffects on his feedback mod?


As for the service, I would love to have it done by someone experienced in modding the Dl4 pedals of course, but I dont have the money, I dont live in the US and Im able to do it perfectly if I have some guidance.

As for Cubisteffects description, thats the reason why Im asking if this mod its just on the Repeats Pot resistance (as I always tought) or if its a new feedback circuit added to the DL4.
Anyway the Repeats knob is already a feedback circuit, so I dont know if theres any advantage e having another one added to the pedal, also I dont know if everyone does the mod in the same way as Cubisteffects does.

[closetmonster.]

There's a decent thread on the same topic here:

http://experimentalistsanonymous.com/board/index.php?topic=82.0

There's a couple of feedback loop mods in there. One where they just fed the output back to the input, and another which apparently gets a little bit crazier. Both are pretty basic.

[closetmonster.]

Just realized that was exactly what you linked.

Anyways, I'd go with what experanon recommend. Colin knows his stuff.

Plus, out of everything I've read on mods to the DL4 it seems to be the easiest. By which I mean if it doesn't work out, it is very reversable

[Mark Hammer]

Impressive mods.

[christonick]

Sorry, I was only linking because it's the best description on how to do the mod yourself that i've been able to find.  I think the advantage is that you can set presets with the regular Repeats knob, while the additional feedback knob would help rein in the unwanted over-oscillation, and could be left alone (sort of as a third preset when the "feedback" switch is stomped. The feedback section is just output rerouted back into the input via the stomp switch.  Probably not any extra circuit.  Though you could   Toward the bottom of that linked page:

re-routing the output of the Modeler back into the input, and the new output selected by a switch on the top of the chassis. This is a feedback loop, and causes spontaneous bursts of noise, squeals, oscillations, drones – all depending on the setting selected. This modification is definitely for the more adventurous musician, but with every effect, the feedback can be used subtly. Most times the feedback can be deafeningly loud, so I have installed a separate BLEND knob to dial in the volume you wish.st be used with caution. The second knob controls the INTENSITY of the feedback allowing control of the amount, pitch, speed of the feedback depending on the delay setting..

The last sentence leads me to believe you are correct: he's just adding another pot to control the "Repeats" knob.

[ilcaccillo]

There's a decent thread on the same topic here:

http://experimentalistsanonymous.com/board/index.php?topic=82.0

There's a couple of feedback loop mods in there. One where they just fed the output back to the input, and another which apparently gets a little bit crazier. Both are pretty basic.

Oh, thank you so much.

I've seen that thread so many times while searching for the subject but as it was circuit bent oriented I missed one small sentence in a small post "When you open the pedal up and look at the input and output jacks, there are six solder point to each jack. Connect the bottom right of an input to the bottom right of an output, and you have a feedback loop."

Thats my answer over there, so simple and basic

Thanks

[ilcaccillo]

Just realized that was exactly what you linked.

Anyways, I'd go with what experanon recommend. Colin knows his stuff.

Plus, out of everything I've read on mods to the DL4 it seems to be the easiest. By which I mean if it doesn't work out, it is very reversable

Cool stuff, you're the adventurous type!

I'm just going to route the output to the input and put a switch in a middle like zemekky suggested, I like that when I press the switch what will happen next is predictable and consistent.
Expanoncolin mod is a circuit bend, it doesnt always happen the same thing, and if it appears the white noise version you have to turn the pedal off, not nice in a middle of a song, but can be something not that bad in experimental music, depends on what you play.

"One, when you "trigger" these 2 points, it does one of about 3 things:  1. Loud white noise, nothing else, no guitar, no effects, no nothing.  2. Reasonable level feedback loop (the best)  3. Incredibly LOUD feedback loop.
The second problem is, the only way to disengage the noise and go back to your normal pedal is to disconnect the power."


It seems to me that probably the people that are doing the DL4 mods commercially are using zemekky suggested switch, some probably add a pot with the switch to control the loop amount , etc etc

[ilcaccillo]

Sorry, I was only linking because it's the best description on how to do the mod yourself that i've been able to find.  I think the advantage is that you can set presets with the regular Repeats knob, while the additional feedback knob would help rein in the unwanted over-oscillation, and could be left alone (sort of as a third preset when the "feedback" switch is stomped. The feedback section is just output rerouted back into the input via the stomp switch.  Probably not any extra circuit.  Though you could   Toward the bottom of that linked page:

re-routing the output of the Modeler back into the input, and the new output selected by a switch on the top of the chassis. This is a feedback loop, and causes spontaneous bursts of noise, squeals, oscillations, drones – all depending on the setting selected. This modification is definitely for the more adventurous musician, but with every effect, the feedback can be used subtly. Most times the feedback can be deafeningly loud, so I have installed a separate BLEND knob to dial in the volume you wish.st be used with caution. The second knob controls the INTENSITY of the feedback allowing control of the amount, pitch, speed of the feedback depending on the delay setting..

The last sentence leads me to believe you are correct: he's just adding another pot to control the "Repeats" knob.

oh mate its completely fine, thanks for cubieffects link. Actually that was the page that made think a bit more on the subject and post here. I always tough you had to mess arounf with the REPEATS POT, then I realized you could leave that loop alone and do another one.

"BLEND knob to dial in the volume you wish"
"The second knob controls the INTENSITY of the feedback "

The blend knob is easy, could be a POT in the loop to control the amount of output thats reaching the input jacks, the INTENSITY knob I dont know , I have to think about it.

Thanks

[ilcaccillo]

A Fellow DIYer game another idea, a much simpler way of using the Repeats knob for the feedback loop switch:
(if you wanna go that route)

"I think all you would have to do is solder two wires to the repeats pot - one to the middle lug, and one to the outer lug - whichever is the one that makes contact with the wiper when fully clockwise. "

[closetmonster.]

Just realized that was exactly what you linked.

Anyways, I'd go with what experanon recommend. Colin knows his stuff.

Plus, out of everything I've read on mods to the DL4 it seems to be the easiest. By which I mean if it doesn't work out, it is very reversable

Cool stuff, you're the adventurous type!

I'm just going to route the output to the input and put a switch in a middle like zemekky suggested, I like that when I press the switch what will happen next is predictable and consistent.
Expanoncolin mod is a circuit bend, it doesnt always happen the same thing, and if it appears the white noise version you have to turn the pedal off, not nice in a middle of a song, but can be something not that bad in experimental music, depends on what you play.

"One, when you "trigger" these 2 points, it does one of about 3 things:  1. Loud white noise, nothing else, no guitar, no effects, no nothing.  2. Reasonable level feedback loop (the best)  3. Incredibly LOUD feedback loop.
The second problem is, the only way to disengage the noise and go back to your normal pedal is to disconnect the power."

It seems to me that probably the people that are doing the DL4 mods commercially are using zemekky suggested switch, some probably add a pot with the switch to control the loop amount , etc etc

The extra feedback loop works out well. I did the same thing with my EHX BMPi, and it turned out pretty nice. I think I ended up tying one end of the loop to one of the terminals of the sustain knob, so that it wasn't going full boar all the time.