11 of the 17 entries below are not faults. They are documented behaviour that looks like one — marked by design so you can stop looking. “Your unit is fine” is a useful answer and nobody publishes it.
It won't boot, or it hangs on the splash screen
- Firmware or settings in a bad state
Hold footswitches A and H during the first six seconds of the splash screen to reach Recovery Mode. Choose Reset Settings first — it keeps your presets and captures. Only use Factory Reset, which wipes everything, if Reset Settings doesn't clear it.
Quad Cortex Wiki: FAQ- Something plugged in is holding it up
Disconnect every cable except power, wait 30 seconds, then try again. Neural recommend this before a factory reset.
Quad Cortex Wiki: FAQ
It won't let me add a block, but the CPU meter is barely used
Usually a second reverb.
- You have hit a per-path limit, not the CPU ceilingBy design
Move the block to the other path. Rows 1 and 2 are one pair, rows 3 and 4 are the other, and the reverb limit is enforced per pair — with spring reverbs excepted.
Forum: the limit of gears- Bypassed blocks are still costing youBy design
Bypassing does not reduce CPU consumption. Delete what you are not using rather than switching it off.
Quad Cortex User Manual 4.0.0
The Grid and the DSP budget →
My Global EQ works on some presets and not others
- Those presets are over the processing budgetBy design
Global EQ and the Input Gate are automatically disabled when a preset exceeds available resources, without an error. Delete a block from the affected preset.
Quad Cortex User Manual 4.0.0
I plugged a cable in and I/O Settings didn't light up
- That jack has no connection sensingBy design
OUT 1/L, OUT 2/R and CAPTURE OUT do not sense connections. They will never change colour. Nothing is wrong.
Quad Cortex Wiki: FAQ
The output is much quieter than it should be
- TS cable on a quarter-inch outputBy design
OUT 3/L and OUT 4/R are balanced. A TS cable halves the output voltage — you need 6 dB back to reach unity.
Quad Cortex Wiki: Gain Staging- Volume knob is not maxed while you set levels
Set the knob to maximum, get the levels right on the Grid and in I/O Settings, then trim the knob for the room. Otherwise the meters do not describe what leaves the jacks.
Quad Cortex Wiki: Gain Staging
Gain staging, start to finish →
It's clipping and I can't find where
- Input stage too hot for your pickups
Swipe down → I/O Settings → the input. Play a little harder than usual. The meter should just tickle the red. If it buries it, pull IN 1 LEVEL down.
Quad Cortex Wiki: Setting the Input Level- Not enough headroom on a clean patch
Leave 12 dB of headroom on clean tones and 6 dB on distorted ones. Clean patches peak much higher than they feel.
Quad Cortex Wiki: Gain Staging- Input and Output blocks are telling you and you haven't looked
Both flash red when clipping. That is the meter — find which one is flashing and fix that stage.
Quad Cortex Wiki: Gain Staging
Swapping guitars mid-set ruins my levels
There's an audible gap when I change sounds
- You are changing presets where scenes would doBy design
Presets reload the whole rig; scenes recall settings inside a rig that is already loaded and switch instantly. Build the parts of one song as scenes A–H inside a single preset.
Quad Cortex User Manual 4.0.0
Modes, scenes and setlists →
It sounds thin or hollow through my real amp
My pedal in the FX loop distorts or sounds wrong
- The send is running at line levelBy design
Sends are line level at unity by default. Pedals expect instrument level — pull the send down, starting around −5 dB.
Quad Cortex Wiki: FAQ
My IR doesn't sound like it does in my DAW
- It was resampled and truncated on uploadBy design
Every IR is converted to 48 kHz and resized to 1,024 samples — about 21 ms. A long IR with a real tail does not survive that. Nothing you can do on the unit changes it.
Quad Cortex Wiki: FAQ
Cortex Cloud won't connect, or drops constantly
- Weak signal
You need −60 dBm or better. Move the router, move the unit, or use a phone hotspot with “Maximize Compatibility” enabled.
Quad Cortex Wiki: FAQ- Network configuration
Use 2.4 GHz or mixed mode, split mixed bands into separate SSIDs, avoid special characters in the network name, assign the unit a static IP, and prioritise its traffic in QoS.
Quad Cortex Wiki: FAQ
Cortex Control can't see my unit
My Neural plugin won't run on the unit
- Never verified online
The unit needs internet once to verify. After that it runs offline indefinitely.
Quad Cortex product page
My captures come out at the wrong level or feel wrong to play
- INST LEVEL and IN LEVEL confused
INST LEVEL sets how hard the captured device is driven and does not affect the capture. IN LEVEL is the return signal and is the level that matters. Wrong volume means IN LEVEL; wrong feel means INST LEVEL.
Quad Cortex Wiki: Capture Techniques
Making captures →
My wah works on one preset and not the others
- Expression assignments are per-presetBy design
There is no global expression assignment — every preset that needs the pedal has to have it assigned. Build it into your template preset before you make copies.
Quad Cortex Wiki: FAQ
I can't delete a splitter or mixer
- Rows 2 and 4 always carry themBy design
They cannot be fully removed. Drag the S icon fully left and the M icon fully right, then exit to Grid view and delete the empty split rows.
Quad Cortex Wiki: FAQ