Output volume of my Quad Cortex is fluctuating randomly

Quad Cortex Bug Reports
1

CorOS Version: 2.3.0

Describe your issue:
While playing through the QC, the output volume suddenly goes down. I play for a while and it goes up again.

Steps to reproduce your issue:

  1. Turn it on.
  2. Play guitar.
  3. Wait.

I have tried the following things:

  • I have tried rebooting, but it doesn’t change.
  • I restored from a backup, but it doesn’t change.

Anyone else experience this and find a solution?

1 Like
2

Are you using the factory power supply?

3

Yes.

I’ve had the unit for just over 2 years, it’s never been an issue until the last week or so.

Website: www.randywillcox.com

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4

on all outputs?
How are you monitoring? Headphones or speakers?

5

Hey, I know this post has been up for a while, but my QC has also started randomly fluctuating volume. It isn’t isolated to one patch and isn’t a power supply issue. Did you eventually get a resolution? I’m hoping the Cor 3.0 update will fix it.

6

QCvol
I am experiencing the same issue with my QC.
I have attached a GIF file showing the volume randomly changing.
This issue occurred after using ver2.3.1 for a while.
I updated to ver3.0.0, but unfortunately the symptoms have not improved.
I am still using the original power adapter that came with the product.
If it is a software bug, I hope it will be fixed in a future firmware update.

7

it may not be software-related, I’ve seen users with this issue have to send their QC in for repair- you should contact support@neuraldsp.com to see what they recommend

8

I can also confirm this but only with fully loaded patches. As soon as CPU usage hit over70-ish %, the volume sometimes spikes a lot. If I then remove a block and put it back it’s OK again. Pretty sure it’s software related, my unit is new (2 months) and this only happens since 3.0.0. and only when CPU usage is hitting it’s limits.

9

I tried various things based on everyone’s posts.
My symptoms occurred regardless of CPU usage.
When I reported the symptoms to the official support desk, they replied that it was a hardware problem and that they would accept it for repair.

My QC returned from repair the other day.
After checking its behavior on its own, I installed it on a pedal board and checked it again.
The problem was resolved.
The repair report stated that “the encoder board was replaced.”
It seems that this is indeed a hardware problem and that a repair is necessary.

1 Like
10

Can I ask how long it took to receive the QC back from Finland? Did you send it with DHL Express service or something? Where did you send it from to NDSP?

11

I live in Japan, so please understand that my situation is different.
In conclusion, the QC was not sent to Finland, but was repaired in Japan by a Japanese distributor.
The flow I experienced is as follows:

  1. I left the QC at the store where I purchased it.
  2. The QC was repaired by the distributor in Japan, via the store.
  3. The QC was returned to the store where I purchased it, and I picked it up after it was repaired.

It took 11 days from when I left the QC at the store until I received it.

12

Ah I got it, yes totally different story :slight_smile: Besides I think it’s still quite long for such a local solution. But I admit you are lucky.

I live in Turkey and sometimes I see bad dreams :sweat_smile:

13

A number of people have posted about this issue in the past. I wonder if it’s an issue with a bad solder connection on the encoder board or just oxidation on the encoder contacts. If the latter, turning the volume knob all the way up and all the way down a few times may temporarily fix it. I once had a Line 6 combo amp (back in the dark ages) that had a similar problem. I opened it up and treated all of the encoders with De Oxit and never had the problem again. If your QC is still under warranty, having the board replaced is probably the best solution as fixing it yourself would likely void the warranty.