I've been sending tons of MIDI to the dtxpress without any
eroneous noise, but I have heard this noise on other systems and
, in most cases, it turned out to be caused from crosstalk in
the audio cables/mixer/ground loop/etc.
I would start from ground zero and attempt to eliminate
the noise source through process of elimination.
ken anthony
--- In DTXpress@egroups.com, "Rich" <rich@t...> wrote:
> Hey Dan, that's rather bizarre. Let us know if the solution
sticks. I have
> the same issue as I said before, so I am definitely interested. I
just
> figured the OS was written poorly. For me the clicks only occur
when midi
> data is sent to the unit, not if its in "local on" mode. I guess
it is
> possible a midi ground could interact with audio. I am wondering
why an OS
> reset clears the problem for me but not you, and how it is possible
for
> software to create a grounding issue, but I'm glad you are getting
a handle
> on it. Rich
> Unique Sample CD Roms, Loops and SoundFonts
> Main site: http://www.tweakheadz.com
> MP3 files: http://www.mp3.com/tweakheadz
>
> ----- Original Message -----
> From: "Dan Mowczan" <pinball@h...>
> To: <DTXpress@egroups.com>
> Sent: Monday, January 15, 2001 12:04 AM
> Subject: Re: [DTXpress] MIDI transmission causes noise?
>
>
> > Hey everyone, last post on this topic, I found something that is a
> solution,
> > albeit something I need to learn more about. And, wanted to send
this to
> > the people who responded and wanted to know what I found (mainly
wether or
> > not my unit was to be determined faulty).
> >
> > When I run my Roland KC-500 through a two to three prong adapter,
the
> > ticking disappears. I ran across something similar when I set up
my home
> > theatre system. The Klipsch subwoofer actually came with a three-
to-two
> > prong adapter, indicating it should be used if inexplicable noise
appears,
> > and they recommended getting a ground isolator for my cable line
if this
> > solved the problem. It was the solution there, and it is in fact
seeming
> to
> > be the solution here. Of course, determining where the ground
problem
> > exists is critical to the safety of my equipment.
> >
> > Thanks for the friendly responses!
> >
> > -Dan
> >
> > --
> > Dan Mowczan, pinball@h...
> >
> > > From: Dan Mowczan <pinball@h...>
> > > Reply-To: DTXpress@egroups.com
> > > Date: Mon, 15 Jan 2001 00:14:35 -0500
> > > To: <DTXpress@egroups.com>
> > > Subject: Re: [DTXpress] MIDI transmission causes noise?
> > >
> > > Shoot, no solution. Even the 'pulse' during non-communication
(which I
> > > assume is some sort of watchdog to insure communication exists)
pulse
> right
> > > through and after a reset. I'm going to call Yamaha tommorrow
and get
> their
> > > thoughts on it.
> > >
> > > -Dan
> > >
> > > --
> > > Dan Mowczan, pinball@h...
> > >
> > >> From: "Rich" <rich@t...>
> > >> Organization: Tweakheadz Audio Lab
> > >> Reply-To: DTXpress@egroups.com
> > >> Date: Sun, 14 Jan 2001 01:41:47 -0600
> > >> To: <DTXpress@egroups.com>
> > >> Subject: Re: [DTXpress] MIDI transmission causes noise?
> > >>
> > >> Dan,
> > >>
> > >>
> > >> I had the same problem. What i think is going on is that the
DTXpress
> > >> internal memory management gets corrupted. The solution is to
reset
> the
> > >> machine by using the sequence of button pushes detailed in the
manual.
> You
> > >> will lose all custom patches unless you save them via sysex
1st. You
> can
> > >> load them back in after the reset. They will still work and
the pops
> will
> > >> be gone.
> > >>
> > >> Best,
> > >> Rich
> > >> Unique Sample CD Roms, Loops and SoundFonts
> > >> Main site: http://www.tweakheadz.com
> > >> MP3 files: http://www.mp3.com/tweakheadz
> > >>
> > >> ----- Original Message -----
> > >> From: "Dan Mowczan" <pinball@h...>
> > >> To: <DTXpress@egroups.com>
> > >> Sent: Saturday, January 13, 2001 8:42 PM
> > >> Subject: [DTXpress] MIDI transmission causes noise?
> > >>
> > >>
> > >>> I recently purchased a Roland UM-1 USB Midi interface so I
could get
> some
> > >>> communications working with my PC for storing drum kits.
It's a cool
> > >> little
> > >>> interface, and fairly inexpensive ($49 at Edirol's site) if
you want a
> USB
> > >>> type.
> > >>>
> > >>> Of course, the driver is crashing my Mac. But, that's
another story.
> > >>>
> > >>> I threw the driver on a PC and started working immediately.
I pulled
> up a
> > >>> MIDI file of some Piano and it played beautifully, except
there was a
> > >>> cackling coming from my amp, kind of a static or popping
sound. At
> first
> > >> I
> > >>> thought 'Boy, these are some bad GM sounds', but after then
> downloading
> > >> some
> > >>> kits from DTXpressions to play with, I hit the 'Send' key on
DTXchange
> and
> > >>> during the entire send, the popping was occuring, this time
at a much
> > >> faster
> > >>> speed, but only for the two seconds or so required to receive
the kit.
> It
> > >>> seems that any MIDI data received causes an audio glitch in
the
> outputs.
> > >>> The transmission worked properly, however.
> > >>>
> > >>> Then, I noticed anytime MIDI was hooked up, there is a slight
ticking
> from
> > >>> my DTXpress brain in the neighborhood of 240-260bpm.
Disconnecting
> the
> > >>> Roland UM-1 from the MIDI cable, effectively powering it
down, stops
> the
> > >>> ticking. Shutting down the computer but leaving the cables
connected
> also
> > >>> stops the ticking. When the windows driver is running, the
ticking
> > >> occurs.
> > >>>
> > >>> Finally, I did a bulk dump of data from the DTXpress brain.
This I
> can't
> > >>> get to work at all. The PC doesn't simply doesn't seem to
see any
> data.
> > >>> During this, I get no popping or static through the amp
however.
> > >>>
> > >>> In frustration, I swapped the MIDI cables in and out in case
I did
> > >> something
> > >>> wrong, which didn't do a thing, but when they were swapped, I
was
> getting
> > >> a
> > >>> significant ground hum from my Amp that I wasn't before.
> > >>>
> > >>> Any ideas on what's causing this? I also can't seem to
detect any of
> this
> > >>> through my headphone jack, but based on the volume output on
it, I
Show quoted textHide quoted text
> can't
> > >> say
> > >>> for sure if it is there or not.
> > >>>
> > >>> -Dan
> > >>>
> > >>>
> > >>>
> > >>> --
> > >>> Dan Mowczan, pinball@h...
> > >>>
> > >>>
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