Noises from Kronos' USB audio out

[beurre]

Hi pedro5,

What do you mean by changed the usb port ?

I just connected the usb cable to the other usb socket on the computer.

Just to be clear....
You have tried different usb cables ?....yes.

Also,muted the microphone on the mac ?

Does the input and output applet (system preferences) actually correspond to what you have selected elsewhere ?
eg- If using aggregate devices....does it display them correctly ?

Yes, I tried that all!

Using an alternative computer could help,as long as you use exactly the same set up,hardware and cables etc.

I plugged the Kronos to another macbook pro (same OS version, but previous model) via USB and the incoming audio signal is fine (it has been playing for at least 30 minutes).
I used a demo version of Ableton Live, selected "Kronos" as input device and "Built-In" as out device and set an audio track to monitoring.

I'm sure there isn't any Korg driver installed on this computer.
Maybe if I uninstall the Korg USB-MIDI driver from my computer... but there isn't such an option in the installation package you can download from their site.
I found this file on my computer: Macintosh HD -> Library -> Audio -> MIDI Drivers -> KorgUSBMIDIDriver.plugin
Can I just try removing it? Maybe there's something else elsewhere on the HD.
Any ideas?

[SanderXpander]

Thanks SanderXpander.

Very important points indeed.

The workaround for this is to connect usb audio devices via an usb2 hub,which will configure the usb3 port accordingly.

I honestly don't believe this makes any difference. Not to mention you're adding another latency-inducing interface with the hub.

[pedro5]

beurre

It sounds encouraging that you're finding a set up that works,which indicates a mac problem.

Have you checked the usb function via System Information ?

As a suggestion,visit one or more imac forums to see if there's any information that could help.

The driver can be removed by placing it in the trash.
It is the one you mentioned and as far as I know,it's the only entry......unless you have a multi boot computer and it's resident elsewhere,as well.

However,although the kronos will work without it....it's recommended that it remains installed.
You can still try it without,if you wish.

Keep us informed.


SanderXpander

So far, I've not detected any latency problems using the kronos via an usb2 hub,I'm reluctant to connect it directly though,due to past experiences and also for the reasons you have already mentioned.

Also,it's been suggested elsewhere (I can't remember where,though) that using the hub method with recent imacs work better for usb2 audio devices,even though there may be some risk of additonal latencey in certain cases.


My set up, having around ten usb devices with only four usb ports on the imac,forces a compromise with their connections.
Two hard drives have their own ports.
The other two ports have hubs connected to them which includes another hard drive,printer,mouse and other periphials....plus the kronos and a pa900.
As said...it all works just fine.
(Hope I'm not tempting fate here... ).

Best Wishes to All.

[beurre]

It sounds encouraging that you're finding a set up that works,which indicates a mac problem.

Yeah, kind of. The question now is: is it a hardware or software issue?

Have you checked the usb function via System Information ?

I checked it and everything looks fine.
I also ran the Apple Diagnostics and nothing showed up.

As a suggestion,visit one or more imac forums to see if there's any information that could help.

The driver can be removed by placing it in the trash.
It is the one you mentioned and as far as I know,it's the only entry......unless you have a multi boot computer and it's resident elsewhere,as well.

However,although the kronos will work without it....it's recommended that it remains installed.
You can still try it without,if you wish.

I deleted that driver, deleted all the drivers and the problem was still there. So I just restored the midi drivers. They're not audio drivers, after all.

I created a new user and logged in with a different account but that didn't help.

I also tried uninstalling the Mbox. It worked fine for something like 15-20 minutes. I was convinced that solved the problem when suddenly the it came back.
Something I noticed, if it can help, is that the notes started coming in with an increasing delay (from .5s to 2s) before the disaster reappeared.

Looking for similar cases in forums, I found a user on an apple board, which I discovered also wrote here and was experiencing a similar problem. The thread is titled "Kronos X not working with Imac (Late 2013)?". It would be interesting to hear if there are any news.

I just was able to play without issues for 30 minutes when the problem arose again.
Here's a clip so you can get an idea (be careful, the noise/distortion is very loud!):
https://www.dropbox.com/s/jswtievosmmo8 ... e.mp3?dl=0

[pedro5]

Yes that's the excactly what I had !!!!

The forum reference you show is the one I was involved with on this forum......
(Posted a few comments as you can see).

All I can say now is that it's an imac problem which has affected others as well,but so far no real cure has been put forward (I haven't checked recently,though).
If your computer is under warranty or you have applecare,contact apple.

Which imac do you have ?

The only snag is convincing them there's a fault, as at the moment probably nothing has actually failed on your imac.
In my case two usb ports had stopped working,so they had to repair it anyway.

One thing you could try is to reduce the kronos output level using the master slider.....it was after I did this several times things began working again,but it may have been just a coincidence.

I also suggest that you go over your settings one more time (I know you've already done this) especially the logic ones and pay attention to how it's related to the imac
input/output plus aggregate parts.
You will need to be as methodical as possible without rushing....sorry,I'm sort of "clutching at straws" here,as I don't know what else to suggest.

I do wish you luck with this.....and would appreciate further updates with whatever happens.

Best Wishes.

[beurre]

Yes that's the excactly what I had !!!!

The forum reference you show is the one I was involved with on this forum......
(Posted a few comments as you can see).

All I can say now is that it's an imac problem which has affected others as well,but so far no real cure has been put forward (I haven't checked recently,though).
If your computer is under warranty or you have applecare,contact apple.

Which imac do you have ?

The only snag is convincing them there's a fault, as at the moment probably nothing has actually failed on your imac.
In my case two usb ports had stopped working,so they had to repair it anyway.

One thing you could try is to reduce the kronos output level using the master slider.....it was after I did this several times things began working again,but it may have been just a coincidence.

I also suggest that you go over your settings one more time (I know you've already done this) especially the logic ones and pay attention to how it's related to the imac
input/output plus aggregate parts.
You will need to be as methodical as possible without rushing....sorry,I'm sort of "clutching at straws" here,as I don't know what else to suggest.

I do wish you luck with this.....and would appreciate further updates with whatever happens.

Best Wishes.

I have a macbook pro 15" retina, not an imac.
So did you have the same problem and was it a hardware issue?
How can I demonstrate this to apple? Their diagnostic software says everything is fine...

[beurre]

Hi,
today I called Apple Support and explained my problem to 3 different people. I followed the usual suggestions to reset the SMC and the PRAM but that didn't change anything. The fact that you can't talk to the same person every time you contact the support is quite annoying.
The last suggestion I got was to reinstall the os from the OS X Recovery. I'll try that later since it will take time.

[pedro5]

Thanks for letting us know the latest.

I'm in the process of writing a proper reply to you,with some suggestions(not a cure,though,just some ideas).

One was to contact apple...the other was to visit one of their service centres where they have consultation desks....by appointment etc.

If you have applecare,they should be more helpful and any work carried out on your computer will be without charge,even if they can't find anything wrong.
Having current warranty will only cover actual defects.

Don't know which you have.


Re-installing the os may make a differnce,but I doubt it....as it's already been tried in the past by those who have had this problem.

I'm thinking along the lines of actuall settings and the procedure involved that may help,because that was all that I did and somehow the problem was resolved.

Shall provide further details later.....but it will be via a pm to you rather than on the main forum page here.
Hope this will be ok with you....??

I really am aware of the plight your in and all the frustration it creates.....been there already....
Do bear with me though,we shall try to solve this step by step....if you're willing to do so.

Untill later,my friend.

[beurre]

Hi pedro5,

Thanks for letting us know the latest.

I'm in the process of writing a proper reply to you,with some suggestions(not a cure,though,just some ideas).

One was to contact apple...the other was to visit one of their service centres where they have consultation desks....by appointment etc.

Going to the Apple Store with my Kronos would be funny, but I'd definitely do that if necessary.

If you have applecare,they should be more helpful and any work carried out on your computer will be without charge,even if they can't find anything wrong.
Having current warranty will only cover actual defects.

Don't know which you have.

Fortunately (and strangely enough) I've applecare.

Re-installing the os may make a differnce,but I doubt it....as it's already been tried in the past by those who have had this problem.

I'm thinking along the lines of actuall settings and the procedure involved that may help,because that was all that I did and somehow the problem was resolved.

I've doubts about the osx installation too, but I can give it a try.
Also a new installation on an external drive could be revealing, but again, that takes time.
I'm curious to hear how you solved this in the end. Did you have your machine changed, serviced or you just solved it via settings?

Shall provide further details later.....but it will be via a pm to you rather than on the main forum page here.
Hope this will be ok with you....??

That would be great, thanks!
I'm keeping this conversation public so other people with the same problem would find it. Please feel free to do what's best for the forum's conduct too.

Many thanks!