31 Jul
2004
31 Jul
'04
11:24 p.m.
I have my keyboard midi ports connected to my computer
through the
game port on my motherboard sound card. It works fine, except I'm
hearing some noise through the audio output on my keyboard when the
midi cable is plugged into my computer. Whenever my computer is on
(whether or not the keyboard is), I hear a buzz, and it gets louder
whenever the hard disk is in use. Is there anything I can do to
correct this?
I had some really strange pops and buzzes with a new soundcard yesterday,
Turns out I'd forgotten to go in with alsamixer and mute/turn down
all the inputs I wasn't using. The unmuted mic input was the problem
even though nothing was plugged into it.
Worth a try...
1 Aug
1 Aug
12:38 a.m.
On Saturday 31 July 2004 08:44 pm, Andrew Burgess wrote:
First rule of trying to master anything on a PC, mute every channel that's not
being used. It's pretty noisy RF-wise inside the case and nothing is properly
shielded. Even if you use the digital side of the CD player connection, the
wire is still an antenna. FM synth chips are also noisy at idle.
I have my
keyboard midi ports connected to my computer through the
game port on my motherboard sound card. It works fine, except I'm
hearing some noise through the audio output on my keyboard when the
midi cable is plugged into my computer. Whenever my computer is on
(whether or not the keyboard is), I hear a buzz, and it gets louder
whenever the hard disk is in use. Is there anything I can do to
correct this?
I had some really strange pops and buzzes with a new soundcard yesterday,
Turns out I'd forgotten to go in with alsamixer and mute/turn down
all the inputs I wasn't using. The unmuted mic input was the problem
even though nothing was plugged into it.
Worth a try... 
6:46 a.m.
Someone wrote:
>I have my keyboard midi ports connected to my
computer through the
>game port on my motherboard sound card. It works fine, except I'm
>hearing some noise through the audio output on my keyboard when the
>midi cable is plugged into my computer. Whenever my computer is on
>(whether or not the keyboard is), I hear a buzz, and it gets louder
>whenever the hard disk is in use. Is there anything I can do to
>correct this?
(sorry missed the original message)
Sounds like a groud loop to me, I think the solution is to change the
state of the group/shielding in the MIDI cable, but I'm not really sure,
google for "ground loop midi" you will find lots of refereneces.
Normal MIDI cables are supposed to prevent ground loops, but those ones
that plugin into D-type soundcard connectors can cause prolems, and I've
had problems with combinations of normal MIDI cables and/or XLR cables
that were wired wrongly.
- Steve
7413
days inactive
7414
days old
linux-audio-user@lists.linuxaudio.org
2 comments
3 participants
participants (3)
-
Andrew Burgess -
John Check -
Steve Harris