[LAD] midi controlers

Dennis Schulmeister linux-audio-dev at windows3.de
Sun Jul 13 13:37:14 UTC 2014


On Sat, 12 Jul 2014 09:17:02 -0700 (PDT)
Len Ovens <len at ovenwerks.net> wrote:

> t would not effect the serial data, but audio may be present on the same 
> device, or another connected to it. I have a USB audio interface that 
> introduces hum to the monitor amp. 

A passive DI-box with ground-lift will to the trick. The problem here
is not the asymmetrical signal since the noise is not inducted to the
wire. It's that any computer introduces quite a lot of buzz and hiss to
the ground wire. You can easily hear when the cursor moves or when data
is read from hard-disc and so on.

Best, Dennis

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