RE: DL-4 hum/buzz when half-speed overdubbing?

["William Walker" <billwalker@looppool.info>]

 The other day Max Valentino contacted me off list with a similar problem,
when using his dl4. At first I thought it might be the hi frequency
distortion common to most piezo pickups being amplified, but now I'm not so
sure. I have noticed it with my two DL4's on occasion particularly when
looping with my acoustic electric guitar and resampling on to a repeater or
jammman, but never to the degree that you mention. perhaps the problem as
Nic suggested is related to something near you radiating EMF's or maybe a
poorly shielded power supply. I've only noticed the sound you speak of when
playing in my studio with a computer screen, large mainframe computer, and
racks of signal processing gear. I do know that those wall warts are
notoriously prone to picking up line noise, if care is not taken to 
separate
them physically from line or power cables. On my main pedal board, I use a
Voodoo labs pedal power to power all of my stomp boxes, including a DL-4,
and have not really noticed this problem. However, recording at half speed
on the DL-4 will give you a greatly reduced sampling rate, and potentially
more sonic artifacts.
 Bill

-----Original Message-----
From: Travis Hartnett [mailto:tiktok@sprintmail.com]
Sent: Sunday, August 15, 2004 3:13 PM
To: Loopers-Delight@loopers-delight.com
Subject: DL-4 hum/buzz when half-speed overdubbing?


The other day I noticed that my Line6 DL-4 now includes an unpleasant
buzz/hum/whine when recording in half-speed mode.  Switching back to
regular speed just shifts it up an octave, although recording and
playing back at full-speed have no problems.  So, I pulled out my spare
(neither one has seen much use recently) and found that it had the same
problem, although to a lesser degree.  Both units are about three years
old and have seen only light usage and been stored on a pedalboard or
somewhere safe, and I've tried different guitars, amps, cable, etc.

I know they didn't used to do this--has anyone else seen this problem?

TravisH