buzzing noise

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andycopeman
Posts: 4
Joined: Sun Nov 20, 2011 12:29 pm

buzzing noise

Postby andycopeman » Sun Nov 27, 2011 2:10 pm

Hi again.

No replies from my previous post yet, nor from KMI support on the same question. I guess I must just be patient.

New one ...

I have a loud buzzing noise when using the softstep. It gets louder when I put my foot near or on the unit, although it's there all the time. It's really annoying, and if I'd known about it I would not have bought the unit.

Initially I thought it might just have been an earth loop as this is mentioned in the manual ... but I run the device through a powered USB hub, along with three other midi/usb devices, and they are effectively in a star configuration, so I don't see how there can be an earth loop issue.

Yesterday I turned off my monitors, shut down my computer (Mac Book Pro) and disconnected the hub from the computer, and noticed that I could still hear the buzzing. It is actually physical vibration noise coming from the softstep.

Has anyone else noticed this? is there a solution? Is it still an earth loop? Do I have a faulty softstep?

Any help much appreciated.

thanks

Andy
mrgorilla
Posts: 53
Joined: Wed Feb 02, 2011 7:51 am

Re: buzzing noise

Postby mrgorilla » Wed Dec 07, 2011 6:59 pm

check out the thread I started.

viewtopic.php?f=10&t=53

I started wondering if since I have a macbook, and that my softstep and my interface run through usb (interface is powered by external), if this is causing. I think my interface can be bus powered if I use firewire. I am going to try with another computer soon since I don't have firewire.
wasi
Posts: 16
Joined: Tue Mar 06, 2012 11:12 pm

Re: buzzing noise

Postby wasi » Wed Mar 07, 2012 12:06 am

Hi

I noticed the same problem and shutting off the backlights stopped it in it's tracks. It's not a classic ground loop (wrong frequency), and the fact that it gets stronger as you bring your foot closer to the softstep (no need to touch it) would indicate so as well. Plugging the interface and the softstep into the same - externally powered and grounded - USB hub stops the buzzing for me it as long as I touch my guitar.

IMHO it's not a classic grounding issue, but rather electromagnetic interference from the LEDs (or whatever it is) that do the backlighting, like standing in front of an old CRT monitor. What we are hearing is the frequency of the light emitted by the backlight and as you bring your foot closer to the softstep, it's inducing electromagnetic interference on your body, creating a field difference between you and the guitar, making the pickups transmit the (180° phase shifted) buzz.

Now, with everything in the same powered hub, if I put my guitar far away, the hum is almost inaudible, but if I keep my foot on over the softstep and reach for my guitar, the closer I get, the louder the buzz gets, until I touch the guitar, at which point it goes away.


Putting my interface and the softstep on the same hub and powering that hub externally aolved it for me. I may have to add though that I'm using the hub on my old Dell monitor, which has a three-prong grounded power chord. I'm a little worried a non-grounded hub power supply may not have that effect? We'll see...
TomSwirly
Posts: 79
Joined: Sun Aug 07, 2011 9:04 am

Re: buzzing noise

Postby TomSwirly » Mon Apr 09, 2012 9:46 am

Just as a data point, I get a tiny, tiny buzzing in my home studio and I don't have a guitar or any electric instrument or amplifier hooked in.

It's definitely the EL backlighting - in fact, I only notice it when I start turning the EL lighting off and on.

It's waaay down there, at least 60dB down, and it doesn't appear to happen within the computer - my outputs can be putting out digital 0s and I'll still hear this.

The powered USB hub is a great way to go, you should be doing that anyway if you have more than one device on your USB hub and you're playing out...
DaveDraper
Posts: 64
Joined: Fri Feb 25, 2011 9:10 am

Re: buzzing noise

Postby DaveDraper » Thu Apr 26, 2012 6:40 am

As a guitar player I'm resigned to having the lights OFF at all times, BUT....I'm building myself a new guitar at the moment, & I'm going to make damned sure that it is THOROUGHLY and effectively earthed. We'll see :)
Dave
mehrdadp
Posts: 18
Joined: Sun Jun 03, 2012 1:34 pm

Re: buzzing noise

Postby mehrdadp » Wed Jun 13, 2012 8:43 pm

How do you turn off the backlights?
MacBook pro, OS 10.10.5, Apple Duet, Ableton Live 9, SoftStep 1 in hosted mode, Amplitube 4.
DaveDraper
Posts: 64
Joined: Fri Feb 25, 2011 9:10 am

Re: buzzing noise

Postby DaveDraper » Thu Jun 14, 2012 2:18 am

open settings -> el on/off, under the main table
Dave
mrgorilla
Posts: 53
Joined: Wed Feb 02, 2011 7:51 am

Re: buzzing noise

Postby mrgorilla » Thu Aug 30, 2012 5:24 am

DaveDraper wrote:open settings -> el on/off, under the main table
Dave


Dave, you get your new guitar to work?
DaveDraper
Posts: 64
Joined: Fri Feb 25, 2011 9:10 am

Re: buzzing noise

Postby DaveDraper » Tue Sep 25, 2012 3:09 am

Er..belatedly, yes thanks (don't check this forum very often!) - the guitar works, nicely earthed, humbucking etc.
But I've still got the SS buzzing noize ('til I switch the lights off).
The annoying thing is that I've got it to remember to switch off the lights when I plug it in, but that comes at the price of a saved 'scene'. I just want the 'INIT' setting so it sends out raw CC data; you can't save that with 'lights off' it seems.
resignedly
Dave

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