Qu5 MB4 insert changes sound

Qu Qu Troubleshooting
1

Insert MB4 multi4flat in the Main. Open the FX window. Play something through the Main. Toggle the insert on and off, or bypass the compressor. The sound changes radically. I notice that the wet and dry sends both default to -4, which seems odd. If I set the dry to off and the wet to 0, the sound doesn’t change when bypassed.

Now insert MB3 multi3flat instead. Still have the -4 levels, but the sound doesn’t change when toggling either the insert or the plug-in’s bypass.

Something is wrong with the MB4. Maybe the latency compensation is slightly off?

2

It’s probably still the same problem.
No one has confirmed it, and A&H probably chose to overlook it.

And the problem occurs even when all four filters are deactivated!
Unless you select Slope 6.

This seems to be an additional problem, because on the SQ I get Dry = -Inf dB and Wet = 0 dB.

3

Same on my QU-5 with say the Chorus modulator plugin!

4

This should also be the case, because a chorus only works by overlaying a dry and modulated signal - like many FX that typically use as send-returns.
But a MultiBD is, first and foremost, a typical insert FX, where a Dry level would reduce again the desired FX from the start, which shouldn’t be the goal.
And if a Dry is also out of phase even when idle (all filters are deactivated!), it should never be a preset.
If that’s the case with the QU 2.0, I’m afraid it’s an additional bug.

5

Thanks @SQuser that makes sense, in regards that the time based fx usually being applied in a Mix–>Return fashion versus Comps inserted on a channel.

6

Oh, that’s definitely a bug. It goes away when the plug-in is bypassed. All filters deactivated should be the same. Is there a place to report bugs other than here?

I’m going to start a separate topic for the return mix defaults.

7

I always hoped that all the bugs submitted here would be registered and fixed, but sometimes it seems better to contact support directly, as people who aren’t registered here in the forum do.
They should usually always get a response and faster help than we do here.

https://support.allen-heath.com/hc/en-gb/requests/new?ticket_form_id=360001516878

8

btw, MB3 also suffers from the same issue. However, the Multi3Flat preset uses slope 6, so it passes cleanly.

9

Yes, it’ll basically be the same.
I haven’t really found a reason why I should ever use the “3” instead of the “4”.
It’s just as confusing and difficult to use, and I assume it doesn’t sound any better too.
And if there are differences, why isn’t there a “2”?
Then at least the cumbersome switching between the two frequency pairs would be eliminated - I often only need one or two frequencies.
So, from my view “2” would make more sense than “3.”
But I digress … )

10

Heard back from an A&H tech. They agree it’s a bug, and will at least change the default insert returns. Eventually.

11

Thanks, but that’s not the bug at all, it’s just an annoyance.
Because you can always store your own insert return values in the user part of the library and call them up as defaults from there.
The real bug is the phase shift between dry and wet, which makes adding the dry signal within the FX unit impossible!

12

That’s why I said “at least”. Users will be able to insert the factory preset without it destroying their signal.