Mod a CE2 into a delay?

Started by benallison, June 04, 2008, 12:09:29 PM

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benallison

Ok, a chorus works by:

1) repeating the input signal a few times, at short intervals (via delay) -- these are known as voices
2) modulating the pitch of each voice via an lfo

Well, a few questions:

1) how many voices are present in CE2 -- 1? 2? 5?
2) is there any mod that can increase the delay time on the order of 100's of ms
3) is there then a mod that can add feedback to the pedal?

Just curious if the CE2 could be jerry rigged into a simple delay (with the flip of a toggle switch to engage feedback circuitry and delay-time multiplier).

Mark Hammer

Actually, there is one assumption in there which is both incorrect and central to your musings.

There is, sadly, but ONE repeat of the delayed signal.  Unlike flangers and analog delays , there is NO RECIRCULATION of the delay signal in a chorus.  Perhaps there are some multi-function pedals that can switch between flange, chorus and delay, and permit recirculation under certain modes, but a chorus pedal will likely never incorporate a feedback path.

Could you take the BBD used in a chorus pedal and use it to produce a viable slapback type delay?  Absolutely.  But conversion of a chorus into a delay would be complicated enough that you really don't want to get started on it.

benallison

That was my fear... I was asking assuming/hoping it wasn't true.

Thanks Mark!

Mark Hammer

SOME pedals, however, would permit what you suggest.  For instance, a Deluxe Electric Mistress lets you freeze the delay time in the "Filter Matrix" mode.  Of course, the delay time aimed for there is short enough that you would hear only peaks and notches, rather than any time difference between an initial signal and copy.  If one was to increase the value of the cap/s that set the clock-range, however, so that the  clock rate was drastically reduced. you could, in principle, produce an audible short delay which the DEM's "Color" control could vary the number of repeats for.  Of course, when a device like a flanger is set for such a high clock speed, the anti-aliasing filter needs are VERY relaxed.  There may be clock noise, but it is so high up you'll never hear it.  Drop that clock rate down to 1/10th its original rate, and the clock noise would be intolerable, requiring more severe lowpass filtering of the delay sigal than the pedal currently has.