2017/12/05 23:18:16
HighAndDry
I get a very low level hum that seems to be related to the mouse.  It is just a usb mouse.  any insights on this?
2017/12/06 11:22:58
fireberd
I would suspect this and your other problem may be related.
2017/12/06 13:01:01
Jim Roseberry
Check for a ground loop.
Check all USB cables.
 
In the past, I've seen a poor quality USB cable cause noise when connecting a Motif ES7.
2017/12/08 18:56:09
HighAndDry
fireberd
I would suspect this and your other problem may be related.


Hmmm.  maybe.  I don't have any other sound drivers enabled.  I thought it perhaps was the hdmi sound.  I disabled that.  
2017/12/08 18:57:40
HighAndDry
Jim Roseberry
Check for a ground loop.
Check all USB cables.
 
In the past, I've seen a poor quality USB cable cause noise when connecting a Motif ES7.


I suspected a cable shielding issue.  the mouse is a fairly cheap usb one.  the usb cable that connects the motu 1248 is decent 
2017/12/08 19:03:39
HighAndDry
Oh. and just to clarify.  I don't have the mackie onyx hooked up on this machine
 
2017/12/12 20:36:13
igiwigi
Buy a cat!!!
 
Naughty mouse or a ground loop
Try another mouse would be my first port of call and then ground loop next.
 
 
2017/12/14 01:11:04
HighAndDry
igiwigi
Buy a cat!!!
 
Naughty mouse or a ground loop
Try another mouse would be my first port of call and then ground loop next.
 
 


hmm how does one find a ground loop?
2017/12/14 14:00:34
Jim Roseberry
You can go thru your entire setup cable-by-cable (with headphones and the headphone-amp opened up a bit)... to find any culprit.  If you do this, be careful with your hearing (no surprise bursts).
 
The easy way to avoid ground-loops is to power your studio gear from a single outlet.
Powering from multiple outlets is virtually guaranteed to cause ground related noise.
Balanced cables can help combat this... and may make the ground-loop inaudible... but the ground issue is still there.
 
If the sound is gone with the mouse unplugged, I'd get a different mouse.
Poorly shielded USB cable can cause audible "digital hash" (grainy sounding noise).
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