Subject: Re: [linux-audio-user] Getting audio noise through midi cable
From: Clemens Ladisch (clemens_AT_ladisch.de)
Date: Thu Jul 29 2004 - 10:35:54 EEST
Phil Carter 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.
Apparently, some MIDI IN connector has pin 2 connected to the ground,
which is a Bad Thing(TM) to do; see
> Is there anything I can do to correct this? Is it because I have a
> cheap sound card? I've thought about getting a somewhat better
> soundcard, possibly an SB Live!, or a USB midi interface instead
> of my gameport midi interface.
The ground loop might be caused by your gameport MIDI interface, so
there is the possibility that you have a chance that a USB MIDI
interface might fix the problem, if you're lucky. However, many other
devices get this wrong, too.
You could try to 'modify' your interface so that pin 2 (the middle
pin) of the MIDI IN connector is permanently disconnected ...
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