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Re: EDP FEEDBACK GHOST



my guess is:

- you have something plugged into the feedback jack on the back, maybe
incorrectly

- you don't have anything in the feedback jack, but the feedback jack is
dirty and so the echoplex thinks there is something plugged in it.

- the feedback jack has somehow become damaged, so the echoplex sometimes
thinks there is something plugged into it.

You see, there is a circuit that detects if something is connected to the
feedback jack. It's possible if the jack is dirty, that the detection
contact will be opened and the echoplex thinks there is something plugged
in. When the echoplex thinks there is something in its feedback jack, it
uses that input for feedback and ignores the feedback knob on the front. If
their is actually nothing in the jack, it will be read as max feedback.
Then you will get the problem you describe. Especially if it is dirty, the
contact will be intermittant, and the feedback thing will come and go like
you are seeing.

Probably if you get some of that electronics contact cleaner (what do they
call that stuff these days anyway?), you can clean the jack with it. Or you
might try plugging/unplugging a cable in the jack a bunch of times, see if
that fixes it. If not, open it up and see if the jack looks bent or damaged
somehow. it's the middle tab on the jack that handles this plug
detection.....

hope this helps,
kim


At 9:25 PM -0700 6/2/99, petr dolak wrote:
>EDP FEEDBACK GHOST
>       Sometimes my EDP ignores the feedback knob.  When I move the knob
>to get
>shorter feedback, it still acts like on max.  I have tried everything to
>fixt it: I move the knob back and forth, I tap the loop again, dub,
>multiply, mute, switch to another loop (there it is the same problem), or
>I even restart EDP, but it is still as if the knob would be on max.  So I
>leave it for some time, and when I get back to it after several minutes,
>EDP follows the feedback knob like if nothing happened.
>       This problem is quite frustrating especially when I am on stage,
>when it
>happens that after a composition where I use max feedback I turn the knob
>down for the next composition -- and EDP ignores it.  But it can be even
>worse: sometimes I play a composition with feedback lower and it is fine,
>then suddenly in the middle of it EDP jumps into max feedback, and I have
>to stop playing.
>       It is like if there was a malicious ghost in my EDP, acting in a
>totally
>unpredictable way.  I cannot figure out any reason why this happens.  This
>problem cannot be caused by receiving a Midi signal for feedback, because
>I am not using Midi for EDP.
>
>I will greatly appreciate any advice.
>
>petr
>===
>
>
>
>
>
>
>Nasledujici oznameni je bohuzel nevyhnutelne.  V zadnem pripade ale
>neznamena, ze bych osobne chtel propagovat tuto spolecnost.
>_________________________________________________________
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______________________________________________________________________
Kim Flint                   | Looper's Delight
kflint@annihilist.com       | http://www.annihilist.com/loop/loop.html
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