Computer noise carrying through USB Cable

sproyd · Post by **sproyd** » Wed Feb 02, 2011 3:38 am

Here is the sound I am getting out of it - I made this track just for KorgForums in about 40 mins. Unmastered so sorry if its a bit quiet.

http://rapidshare.com/files/445735234/KorgForums.mp3

xmlguy · Post by **xmlguy** » Wed Feb 02, 2011 3:48 am

sproyd wrote:Everybody, I have GREAT news.

Glad you confirmed the groundloop problem and fixed it. Groundloops are a pain in the arse. Even though you had to spend some money, if you ever have to use you keyboard at a gig with a PA system, having your own DI box will be good to bring along to hook safely into the breakout box or snake.

synthjoe · Post by **synthjoe** » Thu Feb 03, 2011 12:44 am

Glad for you - now happy music making!

P.S.: Nice song, bears some resemblance to John Cage. A WAV version would be nice so as to better appreciate the quality of your original material...

sproyd · Post by **sproyd** » Thu Feb 03, 2011 8:43 am

Ok everyone i have TERRIBLE news (I wanted to swear but hey this is a public forum)

My microSTATION has stopped working. I am not kidding. It turns on, responds to all of the hardware controls like changing patch or mode but it does not output ANY audio. Not out of the 3.5mm headphone jack and definitely not out of the 1/4 inch output jacks. WTF? Is this some kind of sick coincedince that as soon as I fix the buzz problem the whole thing packs up?? Does this have anything to do with the DI Box?

Whaa?//????/?

synthjoe · Post by **synthjoe** » Thu Feb 03, 2011 11:30 am

It would be a first, if the DI was involved. If no sound from the headphone, I'm afraid it will be a real problem. It would be best to figure out whether a test mode exists and check from test mode, and/or send it back for repair.

Sorry to see all the trouble you're going throgh with this...

xmlguy · Post by **xmlguy** » Thu Feb 03, 2011 11:24 pm

sproyd wrote:Ok everyone i have TERRIBLE news (I wanted to swear but hey this is a public forum)

My microSTATION has stopped working. I am not kidding. It turns on, responds to all of the hardware controls like changing patch or mode but it does not output ANY audio. Not out of the 3.5mm headphone jack and definitely not out of the 1/4 inch output jacks. WTF? Is this some kind of sick coincedince that as soon as I fix the buzz problem the whole thing packs up?? Does this have anything to do with the DI Box?

Whaa?//????/?

Were you using the proper power supplies? There might be some relationship between the ground loop and the failure, but that's hard to determine. You would need to measure the voltage and current with an oscilloscope at various points versus a stable reference voltage. If the voltage supplied to the MicroStation was much too high, for example, it could explain the ground loop and the burning up of the output amplifiers, particularly if you turned up the output very high.

There seems to have been something strange going on. As I said previously, a direct box should not be necessary to hook a line output to a line input over a short distance. So the fact that the DI box stopped the ground loop was treating a symptom, but perhaps not the root cause.