Brief Volume Spike When Switching Scenes

Quad Cortex Bug Reports
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1

CorOS Version: 4.1.1

Describe your issue:

When switching from Scene A to Scene B, I experience an extremely brief but very loud volume spike.

In Scene A, I’m using Amp 1 and Cab 1, both of which are Neural Captures routed in parallel.

When I switch to Scene B, Amp 1 and Cab 1 are bypassed, and Amp 2 (Rols Jazz CH120) becomes active.

At the exact moment of switching scenes, the volume suddenly spikes for a split second before returning to normal.

Steps to reproduce your issue:

  1. Set up Scene A with Amp 1 and Cab 1 (both Neural Captures) routed in parallel.

  2. Set up Scene B so that Amp 1 and Cab 1 are bypassed and Amp 2 (Rols Jazz CH120) is activated.

  3. Switch from Scene A to Scene B while playing the guitar.

  4. Notice the extremely brief but significant volume spike during the transition.

I expected this to happen:

I expect a smooth transition between scenes without any sudden volume spikes or unexpected changes in volume.

I have tried the following things:

  • I have confirmed that the volume spike occurs specifically during the scene transition.

  • Both scenes operate at normal volume levels once the transition is complete.

    • I found that the volume spike does not occur when the Rols Jazz CH120 amp block is disabled.

Is there a known fix or workaround for this issue? Has anyone else experienced something similar?

2

Spikes are often caused by compressors or radical settings changes between Scenes.

Some users find it helps to make sure all the settings match even when a device is bypassed in a Scene. You might want to check all devices and see if any other settings are changing, even when they’re bypassed.

If you can upload the preset to the Cloud we could check it out

3

It happens to me infrequently, but usually it is when I have some parameter with a large shift in values between scenes (as xush mentioned). Sometimes if I tinker with the preset I can fix it. For example, if I have a large change in the master volume / master output on an amp block, I may be able to achieve the same effect using a gain block after the amp. If I have too many other changes happening between scenes, I sometimes use two separate amp blocks and switch between them rather than ramping the settings up & down between scenes.

It’s annoying when it happens, but often can be fixed via trial and error. If someone finds a more definitive way to avoid volume spikes between scenes, please share.

4

I had this issue when changing presets and finally figured out that it was related to using an expression pedal as a master volume (for all presets). Evidently the QC takes a few milliseconds to read the expression pedal when it first opens a preset. If I have the pedal pulled back, there’s a momentary spike. If I operate it closer to “toe down” it’s less noticeable. I haven’t noticed it with scene changes so it may not be related.