Getting Infinite Repeats?

Started by bufftonz, May 26, 2008, 06:48:33 PM

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bufftonz


Has anyone ever bought a delay pedal (analogue or digital) that was limited in Repeat duration (even when repeat knob is already maxed out)? I wanted to bring back up the topic of how one could obtain more longer-lasting or possibly infinite repeats with a delay pedal that is limited in such.

I have a DOD FX96 and read some HC reviews (some of you have already heard of this from previous discussion threads) that running the FX96 causes the pedal to produce better lasting repeats, and the 'Quality" knob has more tonal range; all when pedal is pushed up to 12V instead of usual 9V. (BTW, min value component in FX96 is 16V--marg. safety is rather well enough).

Now the other alternative to this is to possibly do a mod to the circuit. There is a 0.22uF cap and a 10K resistor that I see the comes in series before the middle lug of the Repeat pot; just take a look at the schematics below (in the link) and look in the area designated as Repeat/Regenration.

http://www.schematicheaven.com/effects/dodfx96_echo.pdf

What does everyone think of these suspicious components. Could taking the cap out or replacing with different value cap or res cause longer maximum Repeat durations? Which component is more likely to be resposible for limiting amount of Repeats?
(unfortunately most of the resistors are 1/10 Watt and would be difficult to work with by hand, might need computerized robots I'm suspecting)? Excfept the cap, the cap is regular huma-wprkable size component.

--Chris


Mark Hammer

The only way to get truly infinite repeats, as in a looper where the 50th repeat sound exactly the same as the first, would be in the digital mode.  Keep in mind that in the analog domain there will likely be lowpass filtering before the BBD and after the BBD as well.  That filtering needs to be there, and will effectively lop a little more and a little more off the signal with each repeat.  Indeed, the more repeats one plans to have, the more severe that filtering needs to be.  That progressive lopping will limit the lifespan of the recirculated signal.

With severe filtering, there is a chance, but of course you pay the price.  The Modcan Super Delay that former forum member Mike Irwin designed ( http://www.modcan.com/modhtml/manuals/Super%20Delay.pdf ) for Modcan ( http://www.modcan.com/modhtml/modules.html ) can apparently be set for near infinite repeats.  Mike told me that you could come back to it after an extended period of time (on the order of at least minutes) and "still recognize the original signal".  Of course, simply being able to have some remote sense of what the original notes played were is different from the sort of same-bandwidth-goes-on-forever sound one hopes for with infinite looping.