# Qu Troubleshooting **URL:** https://forums.allen-heath.com/c/qu/qu-troubleshooting/41.md [Latest](https://forums.allen-heath.com/latest.md) · [Categories](https://forums.allen-heath.com/categories.md) · [Tags](https://forums.allen-heath.com/tags.md) --- ## ['Drifting' Gain](https://forums.allen-heath.com/t/drifting-gain/33218)
**Author:** [@rjg777](https://forums.allen-heath.com/u/rjg777)\ **Replies:** 8\ **Last updated:** [25 October 2026 19:40 UTC](https://forums.allen-heath.com/t/drifting-gain/33218 "2026-10-25T19:40:10Z")
Hello Everyone, Over the last year, the maximum gain before feedback for my two phantom-powered mics has been gradually decreasing: 24dB originally for both for years, now 15dB for a condenser pulpit mic and just 8dB fo… --- ## [Channel with USB assigned freezes desk](https://forums.allen-heath.com/t/channel-with-usb-assigned-freezes-desk/33225)
**Author:** [@Deemac](https://forums.allen-heath.com/u/Deemac)\ **Replies:** 0\ **Last updated:** [25 October 2026 13:55 UTC](https://forums.allen-heath.com/t/channel-with-usb-assigned-freezes-desk/33225 "2026-10-25T13:55:11Z")
QU5 user here. Since installing the latest firmware (1.2) if I go to a channel assigned to the USB pen drive (for playing backing tracks during breaks), if I switch the compressor on that channel on and off and back on t… --- ## [QU-5D Dante clock issues](https://forums.allen-heath.com/t/qu-5d-dante-clock-issues/33088)
**Author:** [@SowattMusic](https://forums.allen-heath.com/u/SowattMusic)\ **Replies:** 8\ **Last updated:** [23 October 2026 13:06 UTC](https://forums.allen-heath.com/t/qu-5d-dante-clock-issues/33088 "2026-10-23T13:06:36Z")
QU-5D – Repeated Dante Clock Loss and Audio Dropouts Our client’s QU-5D is intermittently losing Dante synchronization, resulting in random audio dropouts. The QU-5D is configured as a Dante clock slave (Clock Source = … --- ## [Qu-5 SMR Reverb Stops and Restarts When Changing Scenes](https://forums.allen-heath.com/t/qu-5-smr-reverb-stops-and-restarts-when-changing-scenes/33172)
**Author:** [@obscuremachines](https://forums.allen-heath.com/u/obscuremachines)\ **Replies:** 0\ **Last updated:** [19 October 2026 03:12 UTC](https://forums.allen-heath.com/t/qu-5-smr-reverb-stops-and-restarts-when-changing-scenes/33172 "2026-10-19T03:12:13Z")
I’m having an issue where the SMR reverb stops and restarts when changing scenes while using an FX send. The delay works fine and hangs over through the scene change, but the reverb cuts out briefly and builds back up. T… --- ## [Loud screach noise](https://forums.allen-heath.com/t/loud-screach-noise/33166)
**Author:** [@Sweep1976](https://forums.allen-heath.com/u/Sweep1976)\ **Replies:** 5\ **Last updated:** [18 October 2026 18:55 UTC](https://forums.allen-heath.com/t/loud-screach-noise/33166 "2026-10-18T18:55:09Z")
Hi I am using a qu-24 and from time to time I get this loud screeching noise, almost like the noise an old dial up router makes. I am using the desk in live music situations with signal coming via an analog snake. The… --- ## [How do you map a Channel to windows 11 default audio WDM input](https://forums.allen-heath.com/t/how-do-you-map-a-channel-to-windows-11-default-audio-wdm-input/33150)
**Author:** [@Paul\_Reynolds](https://forums.allen-heath.com/u/Paul_Reynolds)\ **Replies:** 1\ **Last updated:** [16 October 2026 16:12 UTC](https://forums.allen-heath.com/t/how-do-you-map-a-channel-to-windows-11-default-audio-wdm-input/33150 "2026-10-16T16:12:39Z")
How do you map a Channel to windows 11 default audio WDM input? --- ## [Loss of Midi Control](https://forums.allen-heath.com/t/loss-of-midi-control/33117)
**Author:** [@brianholder](https://forums.allen-heath.com/u/brianholder)\ **Replies:** 0\ **Last updated:** [8 October 2026 10:23 UTC](https://forums.allen-heath.com/t/loss-of-midi-control/33117 "2026-10-08T10:23:25Z")
I am using Multiplay to control my mixer scenes. Recently I changed mixer to Allen & Heath QU5 which uses software on the computer (Allen & Heath Midi Control) rather than external hardware to output the midi control to… --- ## [Problem using the Qu 24 usb 2 socket](https://forums.allen-heath.com/t/problem-using-the-qu-24-usb-2-socket/33080)
**Author:** [@DH7](https://forums.allen-heath.com/u/DH7)\ **Replies:** 5\ **Last updated:** [5 October 2026 21:20 UTC](https://forums.allen-heath.com/t/problem-using-the-qu-24-usb-2-socket/33080 "2026-10-05T21:20:51Z")
Trying link our QU 24 to a computer via the type B USB socket on the mixer to try and run a speech output into “Breeze Translate” Currently I can’t get the computer to see anything from the mixer. Anyone had any experie… --- ## [Are QU series card and usb hot swapable?](https://forums.allen-heath.com/t/are-qu-series-card-and-usb-hot-swapable/32227)
**Author:** [@nitram](https://forums.allen-heath.com/u/nitram)\ **Replies:** 4\ **Last updated:** [2 October 2026 03:38 UTC](https://forums.allen-heath.com/t/are-qu-series-card-and-usb-hot-swapable/32227 "2026-10-02T03:38:32Z")
I noticed on my SQ if I pull the USB the desk notices and shows such… plugging in the usb and the desk sees and responds my new QU5 hangs. doesn’t notice if I pull card or card looking at the usb utility without eith… --- ## [Qu-5 Main outs and Headphones hearing input ST1 (L & R) no matter what](https://forums.allen-heath.com/t/qu-5-main-outs-and-headphones-hearing-input-st1-l-r-no-matter-what/33047)
**Author:** [@IzenEars](https://forums.allen-heath.com/u/IzenEars)\ **Replies:** 8\ **Last updated:** [1 October 2026 06:20 UTC](https://forums.allen-heath.com/t/qu-5-main-outs-and-headphones-hearing-input-st1-l-r-no-matter-what/33047 "2026-10-01T06:20:49Z")
I have all inputs muted and faders down, but from the main out and the headphones I hear what sounds like a PAFL of that one channel. But no PAFLs are engaged. It does not come out of the mixes, only the mains and headph… --- ## [QU5 -\> AR2412 Compatibility, Sync/Clocking issue?](https://forums.allen-heath.com/t/qu5-ar2412-compatibility-sync-clocking-issue/33046)
**Author:** [@Andrew\_Parker](https://forums.allen-heath.com/u/Andrew_Parker)\ **Replies:** 0\ **Last updated:** [29 September 2026 23:20 UTC](https://forums.allen-heath.com/t/qu5-ar2412-compatibility-sync-clocking-issue/33046 "2026-09-29T23:20:01Z")
At our shop we’ve got a few A&H mixers and stage boxes, but we’ve had issues almost every time we pair our new QU5 with our AR2412 stage box. Sometimes, the inputs from the stage box sound like they’re being put through … --- ## [Left channel of a stereo pair has lost ~60db of gain](https://forums.allen-heath.com/t/left-channel-of-a-stereo-pair-has-lost-60db-of-gain/32988)
**Author:** [@bethelpenticton](https://forums.allen-heath.com/u/bethelpenticton)\ **Replies:** 2\ **Last updated:** [28 September 2026 23:47 UTC](https://forums.allen-heath.com/t/left-channel-of-a-stereo-pair-has-lost-60db-of-gain/32988 "2026-09-28T23:47:17Z")
This is the second pair of stereo channels I have doing this. This one is coming from a keyboard. I have to unpair the gain on these stereo channels because all of a sudden I’ve lost ~60db in the left channel. The gates… --- ## [Recording Level on the Stereo USB Drive](https://forums.allen-heath.com/t/recording-level-on-the-stereo-usb-drive/33006)
**Author:** [@Jojo\_har](https://forums.allen-heath.com/u/Jojo_har)\ **Replies:** 3\ **Last updated:** [27 September 2026 18:56 UTC](https://forums.allen-heath.com/t/recording-level-on-the-stereo-usb-drive/33006 "2026-09-27T18:56:38Z")
Hello Allen & Heath Community, we use an Allen & Heath QU5 mixer in the church. For the internet, we record the sermon in stereo onto a USB drive. The routing of the main channels (Main L/R) to USB L/R seems to be corre… --- ## [MY APP QU-PAD CRASH IN PADOS27](https://forums.allen-heath.com/t/my-app-qu-pad-crash-in-pados27/32952)
**Author:** [@luca\_sargenti](https://forums.allen-heath.com/u/luca_sargenti)\ **Replies:** 3\ **Last updated:** [17 September 2026 10:43 UTC](https://forums.allen-heath.com/t/my-app-qu-pad-crash-in-pados27/32952 "2026-09-17T10:43:07Z")
qu pad 1.95 When I try to connect the Qu-Pad app (version 1.95) to my console, or even when opening the offline demo, the app crashes immediately. Is anyone else experiencing this issue on iPadOS 27? Does anyone know ho… --- ## [Qu-24 macOS Tahoe (26) compatability](https://forums.allen-heath.com/t/qu-24-macos-tahoe-26-compatability/32851)
**Author:** [@WillGibson](https://forums.allen-heath.com/u/WillGibson)\ **Replies:** 1\ **Last updated:** [10 September 2026 12:39 UTC](https://forums.allen-heath.com/t/qu-24-macos-tahoe-26-compatability/32851 "2026-09-10T12:39:43Z")
Has anyone used the Qu-24 with macOS Tahoe (26) yet? --- ## [Surging static when using USB-B port of QU-16 for multitrack recording](https://forums.allen-heath.com/t/surging-static-when-using-usb-b-port-of-qu-16-for-multitrack-recording/32855)
**Author:** [@geoffgmf](https://forums.allen-heath.com/u/geoffgmf)\ **Replies:** 0\ **Last updated:** [1 September 2026 03:39 UTC](https://forums.allen-heath.com/t/surging-static-when-using-usb-b-port-of-qu-16-for-multitrack-recording/32855 "2026-09-01T03:39:26Z")
Posting this problem - and its solution - here, in case it helps anyone who experiences a similar problem in the future. I recently used my 2021 MacBook Pro running Sequoia OS 15.7.3 to perform a multitrack recording usi… --- ## [Problems with MIDI CONTROL](https://forums.allen-heath.com/t/problems-with-midi-control/32445)
**Author:** [@Amadeo\_Vargas](https://forums.allen-heath.com/u/Amadeo_Vargas)\ **Replies:** 2\ **Last updated:** [25 August 2026 15:31 UTC](https://forums.allen-heath.com/t/problems-with-midi-control/32445 "2026-08-25T15:31:02Z")
my midi control panel doesnt show me the “qu 32 MIDI out” opcion in the output port. Is there any solution so that i can select it? --- ## [Qu-Pac forced firmware reinstall — the key combination is Channel + Sel 10 (confirmed by A&H Support)](https://forums.allen-heath.com/t/qu-pac-forced-firmware-reinstall-the-key-combination-is-channel-sel-10-confirmed-by-a-h-support/32773)
**Author:** [@CB\_Dreamer11](https://forums.allen-heath.com/u/CB_Dreamer11)\ **Replies:** 0\ **Last updated:** [21 August 2026 15:34 UTC](https://forums.allen-heath.com/t/qu-pac-forced-firmware-reinstall-the-key-combination-is-channel-sel-10-confirmed-by-a-h-support/32773 "2026-08-21T15:34:42Z")
Posting this because the Qu-Pac forced-firmware combination does not appear anywhere public, and the question has been asked here several times over the years without ever being answered — including “Qu-PAC frozen on b… --- ## [Qu-PAC frozen on boot up](https://forums.allen-heath.com/t/qu-pac-frozen-on-boot-up/6436)
**Author:** [@martinl](https://forums.allen-heath.com/u/martinl)\ **Replies:** 1\ **Last updated:** [21 August 2026 13:09 UTC](https://forums.allen-heath.com/t/qu-pac-frozen-on-boot-up/6436 "2026-08-21T13:09:41Z")
My Qupac is frozen on boot up soft pads are lit up and flas but screen is off. I have tried the hard reset to no avail. I’ve have read about boot to firmware methods but how/can this be done on the Qupac? --- ## [Potential Bug - Qu-5 DeEsser allows Mix-\>Return on IP Dir Out](https://forums.allen-heath.com/t/potential-bug-qu-5-deesser-allows-mix-return-on-ip-dir-out/32724)
**Author:** [@AlexG](https://forums.allen-heath.com/u/AlexG)\ **Replies:** 5\ **Last updated:** [16 August 2026 14:35 UTC](https://forums.allen-heath.com/t/potential-bug-qu-5-deesser-allows-mix-return-on-ip-dir-out/32724 "2026-08-16T14:35:25Z")
Hello, I am on Qu-5 firmware version 1.1.3, and just today encountered a very strange situation with the DeEsser plugin. I had previously been using an effect in Fx slot 6 using Mix-Return. I had intended to repurpose … --- ## [Intermittent noise on outputs (L worse than R) — Qu-16, persists after hard reset](https://forums.allen-heath.com/t/intermittent-noise-on-outputs-l-worse-than-r-qu-16-persists-after-hard-reset/32653)
**Author:** [@Federico\_Blanco](https://forums.allen-heath.com/u/Federico_Blanco)\ **Replies:** 3\ **Last updated:** [10 August 2026 03:02 UTC](https://forums.allen-heath.com/t/intermittent-noise-on-outputs-l-worse-than-r-qu-16-persists-after-hard-reset/32653 "2026-08-10T03:02:35Z")
Hi all, I’m having an intermittent noise issue on my Qu-16. The noise only appears on the outputs (not tied to any specific input) and comes and goes sporadically — it’s not constant. It’s noticeably louder on the L out… --- ## [Linked stereo input gain not following in unison?](https://forums.allen-heath.com/t/linked-stereo-input-gain-not-following-in-unison/32601)
**Author:** [@Reaktor8](https://forums.allen-heath.com/u/Reaktor8)\ **Replies:** 7\ **Last updated:** [5 August 2026 09:32 UTC](https://forums.allen-heath.com/t/linked-stereo-input-gain-not-following-in-unison/32601 "2026-08-05T09:32:22Z")
I had an following issue: I had input channels 3 & 4 previously assigned for certain instruments with specific gain setups and I happened to choose to reuse these channels 3 and 4 as linked stereo pair. I hadn’t done any… --- ## [Fader follow issue](https://forums.allen-heath.com/t/fader-follow-issue/32600)
**Author:** [@DJB](https://forums.allen-heath.com/u/DJB)\ **Replies:** 2\ **Last updated:** [27 July 2026 16:44 UTC](https://forums.allen-heath.com/t/fader-follow-issue/32600 "2026-07-27T16:44:07Z")
We are running two Ipads on Sunday morning in addition to our Qu-24. One is for livestream mix and the other is for quick access to soft keys, DCAs…on a custom layer plus remote mixing and setup. Lately I have notice tha… --- ## [How can I troubleshoot some tracks not recording in multitrack mode?](https://forums.allen-heath.com/t/how-can-i-troubleshoot-some-tracks-not-recording-in-multitrack-mode/32393)
**Author:** [@mbirame](https://forums.allen-heath.com/u/mbirame)\ **Replies:** 6\ **Last updated:** [23 July 2026 14:18 UTC](https://forums.allen-heath.com/t/how-can-i-troubleshoot-some-tracks-not-recording-in-multitrack-mode/32393 "2026-07-23T14:18:18Z")
Hi folks, I have a QU-PAC and using one of the thumb drives that is marked as approved on that spreadsheet. I did a couple of recordings without an issue, but I just recorded a rehearsal and four of the tracks didn’t r… --- ## [Qu6 Channel 12 does not output to Mixes 1-6](https://forums.allen-heath.com/t/qu6-channel-12-does-not-output-to-mixes-1-6/32500)
**Author:** [@John\_Saylor](https://forums.allen-heath.com/u/John_Saylor)\ **Replies:** 5\ **Last updated:** [22 July 2026 19:59 UTC](https://forums.allen-heath.com/t/qu6-channel-12-does-not-output-to-mixes-1-6/32500 "2026-07-22T19:59:52Z")
I found a this odd behavior recently. On channel 12, audio signal routes properly to Mix Out 15/16 ( the main mix), but does not pass audio to mixes 1-6. I have made sure Mixes 1-6 are set to pre-fader, and the master i… --- ## [Matrix info request](https://forums.allen-heath.com/t/matrix-info-request/32525)
**Author:** [@DJ\_DELANO](https://forums.allen-heath.com/u/DJ_DELANO)\ **Replies:** 4\ **Last updated:** [16 July 2026 11:18 UTC](https://forums.allen-heath.com/t/matrix-info-request/32525 "2026-07-16T11:18:55Z")
When i use matrix 1/2 as stereo and 3/4 as mono it seems i cant control the volume for matrix 4. i only can control matrix 1/2 and matrix 3.is there a solution? --- ## [Brand new Qu5D - Inconsistent Fader Speed](https://forums.allen-heath.com/t/brand-new-qu5d-inconsistent-fader-speed/32211)
**Author:** [@schpeakers](https://forums.allen-heath.com/u/schpeakers)\ **Replies:** 4\ **Last updated:** [28 June 2026 02:53 UTC](https://forums.allen-heath.com/t/brand-new-qu5d-inconsistent-fader-speed/32211 "2026-06-28T02:53:44Z")
Hi, I just unpacked a brand new Qu5D, and I’m seeing that some faders are slower/laggier than others. I calibrated the faders and it didn’t change anything. The lagginess also isn’t consistent — sometimes the slow guys d… --- ## [FX (5-6) on insert in channels are not saved](https://forums.allen-heath.com/t/fx-5-6-on-insert-in-channels-are-not-saved/32307)
**Author:** [@Olexa](https://forums.allen-heath.com/u/Olexa)\ **Replies:** 5\ **Last updated:** [15 June 2026 17:13 UTC](https://forums.allen-heath.com/t/fx-5-6-on-insert-in-channels-are-not-saved/32307 "2026-06-15T17:13:50Z")
Help! Hello! I’m from Ukraine. I recently purchased a QU-7D. I select FX (5-6) and insert it into the channel via insert. But after rebooting the console it disappears. The FX5 and FX6 tabs are empty. The same thing hap… --- ## [Stereo Aux configuration, left/right?](https://forums.allen-heath.com/t/stereo-aux-configuration-left-right/32251)
**Author:** [@halftime02](https://forums.allen-heath.com/u/halftime02)\ **Replies:** 5\ **Last updated:** [9 June 2026 07:08 UTC](https://forums.allen-heath.com/t/stereo-aux-configuration-left-right/32251 "2026-06-09T07:08:53Z")
In setting up a stereo aux, in this case aux 9/10, I find that I have to go to each aux bus to set the fader level to obtain the stereo field. For example, if I need a backup vocal on the left channel (aux 9), on aux 9,… --- ## [QU5 not recording to card or usb](https://forums.allen-heath.com/t/qu5-not-recording-to-card-or-usb/32226)
**Author:** [@nitram](https://forums.allen-heath.com/u/nitram)\ **Replies:** 3\ **Last updated:** [4 June 2026 16:42 UTC](https://forums.allen-heath.com/t/qu5-not-recording-to-card-or-usb/32226 "2026-06-04T16:42:24Z")
audio inputs are local audio outputs are direct out USB channels 1-16 I see signal on the meters of the output to the SD card multi channel and usb 2trk I touch the record and nothing. Cold boot, factory reset, even … [Next page](https://forums.allen-heath.com/c/qu/qu-troubleshooting/41.md?page=1)