# Possible Gain Drop Issue on Quad Cortex Mini When High Strings Ring Open

**URL:** <https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362>\
**Category:** Bug Reports\
**Tags:** support\
**Created:** [September 17, 2026, 9:47pm UTC](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362 "2026-09-17T21:47:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jrcestari](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jrcestari](https://unity.neuraldsp.com/u/jrcestari)\
**Post date:** [September 17, 2026, 9:47pm UTC](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362/1 "2026-09-17T21:47:45Z")

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Hi everyone,

I think I may have found a possible issue with my Quad Cortex Mini - version 4.1.0 f9381db.

When I use a high-gain preset, if I let the three highest strings — G, B and high E — ring open and then play the low E string, the low E suddenly loses a large amount of gain and sounds much cleaner/thinner.

As soon as I mute the three high strings, the low E immediately gets its normal gain back.

So far, I have tested:

- Noise Reduction completely disabled
- Input Gain at 0 dB
- Different gain levels on the amp
- Different high-gain amp models
- Two different guitars
- A very simple signal chain: Input → Amp → Cab → Output

The problem happens in all of these cases.

It does not seem to be related to a specific guitar, amp model, or Noise Reduction setting.

 ![image](https://us1.discourse-cdn.com/flex020/uploads/neuraldsp/original/2X/e/e564021fd731d687b15ce450f15d04e5ae316450.jpeg)

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**Author:** ![xush](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/xush/32/5100_2.png) [@xush](https://unity.neuraldsp.com/u/xush)\
**Post date:** [September 17, 2026, 10:08pm UTC](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362/2 "2026-09-17T22:08:03Z")

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Deja vu?

> [@Possible Gain Drop Issue on Quad Cortex Mini When High Strings Ring Open](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23255):
>
> Hi everyone, I think I may have found a possible issue with my Quad Cortex Mini - version 4.1.0 f9381db. When I use a high-gain preset, if I let the three highest strings — G, B and high E — ring open and then play the low E string, the low E suddenly loses a large amount of gain and sounds much cleaner/thinner. As soon as I mute the three high strings, the low E immediately gets its normal gain back. So far, I have tested: Noise Reduction completely disabled Input Gain at 0 dB Different g…

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**Author:** ![MP\_Mod](https://avatars.discourse-cdn.com/v4/letter/m/ccd318/32.png) [@MP\_Mod](https://unity.neuraldsp.com/u/MP_Mod)\
**Post date:** [September 17, 2026, 10:38pm UTC](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362/3 "2026-09-17T22:38:02Z")

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Closed due to duplicate posting.

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**Author:** ![MP\_Mod](https://avatars.discourse-cdn.com/v4/letter/m/ccd318/32.png) [@MP\_Mod](https://unity.neuraldsp.com/u/MP_Mod)\
**Post date:** [September 17, 2026, 10:38pm UTC](https://unity.neuraldsp.com/t/possible-gain-drop-issue-on-quad-cortex-mini-when-high-strings-ring-open/23362/4 "2026-09-17T22:38:06Z")

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