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Re: new EDP question

I find this a fine analisis. There is a hiss and yes it does not 
bother as long as a record is done with sound at the input, else it 
may. Luckywhise, I dont see a reason why someone to do such a silent 

>  > > I just got a new Gibson EDP too, and the problem I have is that even
>>  > with silence into the EDP (input disconnected), I get a hiss on the
>>  > looped audio signal.  Anybody else have this problem?
>>  I noticed this basic thing a week ago, while doing some dual EDP 
>>  with another user.  It was most obvious when the dry/wet balance was 
>>  the way to the right (i.e. set to "loop audio only".)
>It's only about half as loud with the mix 50/50 - go figure.
>>  Here's the thing: My unit is a 1995 Oberheim model, and my friend's 
>>  is a Gibson edition which he got about two years ago.  I only noticed 
>>  because he happened to trigger an empty loop with his balance set to
>>  loop only... and I've been using my EDP for six and a half years,
>>  without ever having noticed it before.
>  >
>>  So my hunch is, it's a standard thing that's subtle enough to avoid
>>  detection most of the time.  If you like, I can bring my EDP up to
>>  Loopstock, and you can compare the hiss factor therein...
>Now that I'm off work and back in the lab...
>There appear to be three components to the noise; one is a standard
>dirty-audio-type hiss, the second is a high-pitched whine, and the third 
>a sweep, kind of like a high-frequency test signal.   The pitch of the 
>changes each time I sample a loop, but is always high - like, for 
>example, a
>computer fan noise - almost supersonic.  It sounds a lot like an idling 
>engine from inside the plane (but not as loud).  In some loops, beat
>frequencies are present.
>Interestingly enough, when I feed the EDP's output back into the input, 
>on a short (.10s) loop, and hold overdub for 30 second or so, none of the
>components appear to get any louder.
>FWIW, before it died, my other, Oberheim-branded EDP (of unknown vintage)
>was pretty quiet - I never noticed any noise after Shane fixed the hum.
>>  Lemme ask you this: do you notice any pronounced hiss when you fire up
>>  an initial cycle with an audio signal running into the EDP?  Moreso 
>>  you recall previously?
>If I put in a signal at high enough level, it completely masks the noise.
>When it bothers me, is when I try to start a loop from silence instead of
>with the drum machines already running, and suddenly we're on the runway
>waiting to taxi.  For somebody used to playing through a Twin Reverb, it's
>nothing; but it's loud enough to be annoying in this digital age, 
>when the rest of my early-80's vintage analog e-Bay bargain rig is almost
>I dunno, maybe the whining noise is just me.
>>  --Andre


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