Dragonfly Reverb Bug

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Michael Willis
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Dragonfly Reverb Bug

Post by Michael Willis »

Hi all. There is a discussion on the Ardour forum about a bug in which Dragonfly Room occasionally blasts a high-decibel noise. Naturally this is very concerning to anybody who uses the Dragonfly plugins and values their hearing (which is certainly 100% of the people using these plugins). In the past I fixed a bug with similar symptoms, but I think this is a different bug that causes the same problem.

I need help narrowing down the cause of this bug. Anybody who uses Dragonfly Reverb:

Which Dragonfly plugins do you use?
Have you ever experienced a blast of noise from one of the Dragonfly plugins?
Have you experienced this bug recently? (Let's say in the last six months)
Which plugin exhibited the bug?
Do you run multiple instances of Dragonfly plugins in one project, or a single instance?
What plugin host do you use?
What CPU do you have?

Thanks everybody.
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Re: Dragonfly Reverb Bug

Post by milo »

I've never seen that behavior, and I've been putting Dragonfly to heavy use during the past year. Usually a mix of Hall and Room, occasionally Plate, always with multiple instances. Almost always in Ardour. CPU? Not sure offhand. It's a dual-core 64-bit that came with my 2013 all-in-one Dell Inspiron.
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Re: Dragonfly Reverb Bug

Post by bluebell »

Michael Willis wrote: Tue Jul 21, 2020 4:19 pm Which Dragonfly plugins do you use?
Have you ever experienced a blast of noise from one of the Dragonfly plugins?
Have you experienced this bug recently? (Let's say in the last six months)
Which plugin exhibited the bug?
Do you run multiple instances of Dragonfly plugins in one project, or a single instance?
What plugin host do you use?
What CPU do you have?
Dragonfly Hall (got from github 2020-07-03)
No blast of noise, never experienced
Only single instance in my project
Qtractor as plugin host
Core i7-7700T

Linux – MOTU UltraLite AVB – Qtractor – http://suedwestlicht.saar.de/

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Re: Dragonfly Reverb Bug

Post by sprock »

Always Dragonfly Hall Reverb
Version 2.0.0
Never experienced this problem
Mostly 2 instances (I use reverb busses)
Harrison Mixbus v5
CPU: Intel i3-3110m
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Re: Dragonfly Reverb Bug

Post by luciorgomes »

Which Dragonfly plugins do you use?
-Hall Reverb and Room Reverb (3.2.0)
Have you ever experienced a blast of noise from one of the Dragonfly plugins?
-Yes
Have you experienced this bug recently? (Let's say in the last six months)
-Yes. This is a Mixbus project opened today
Which plugin exhibited the bug?
-Hall Reverb
Do you run multiple instances of Dragonfly plugins in one project, or a single instance?
-Single (in Bus)
What plugin host do you use?
-Mixbus and Ardour
What CPU do you have?
i7-4510U
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Re: Dragonfly Reverb Bug

Post by JamesPeters »

You know the rest of the details since we've been in communication about this, but my CPUs are:

Intel Core i3-6300
AMD Ryzen 7 3700X (my main PC on which I've done most of the testing)

I should add that the project has Hall on a buss with the dry set to zero. I don't know if that affects this or not since we were talking about that other potential bug, but maybe the code doesn't "like" that slider set to zero.

I also haven't been testing Room for this (nor the others) in months.
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Re: Dragonfly Reverb Bug

Post by funkmuscle »

I just launched a project in Mixbus32C and the noise ripped me out of my seat.
This is the first time as I've used Dragonfly for sometime now. This is with Dragonfly Room.
It's like static on an old tubed TV. It's loud too.
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Re: Dragonfly Reverb Bug

Post by Michael Willis »

With help from some folks who discussed this bug with me on Github, there is now a new version with a fix for a bug that could cause bad behavior upon loading the plugins if any dials or sliders were set to zero.

Please download Dragonfly Reverb 3.2.3.

For anybody interested, I made a bad assumption that the constant FP_NAN represents "Not a number", but in reality it is just an enum value that equals zero. You can see the fix here: https://github.com/michaelwillis/dragon ... 5a2a318fff

Edit: Updated link to 3.2.3 instead of 3.2.2 which was broken because I was in too big of a hurry to release it.
Last edited by Michael Willis on Mon Dec 07, 2020 10:57 pm, edited 1 time in total.
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Re: Dragonfly Reverb Bug

Post by lilith »

Great, I had this sometimes too in the past.
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Re: Dragonfly Reverb Bug

Post by Michael Willis »

lilith wrote: Mon Dec 07, 2020 9:38 pm Great, I had this sometimes too in the past.
Let me know how it goes. Please be aware that I originally posted a link to 3.2.2, but it was broken because I was in too much of a hurry to release it. I have updated the download link to be 3.2.3.
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Re: Dragonfly Reverb Bug

Post by Michael Willis »

Somebody in the REAPER forum mentioned that dragonflies feed on large quantities of bugs.

Maybe I should have picked a different name.
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Re: Dragonfly Reverb Bug

Post by uns4ph3 »

Michael Willis wrote: Tue Jul 21, 2020 4:19 pm Which Dragonfly plugins do you use?
Dragonfly Hall and Room primarily. I'm not the best at getting good plate reverb sounds.
Have you ever experienced a blast of noise from one of the Dragonfly plugins?
Until my upgrade to Ardour 6.5, no. Then suddenly, every single project with a purely wet verb would peak the meter ... but no noise actually came out, because I bus that shit.
Have you experienced this bug recently? (Let's say in the last six months)
Yes
Which plugin exhibited the bug?
Both Hall and Room
Do you run multiple instances of Dragonfly plugins in one project, or a single instance?
This has happened with both single instances and multiple instances
What plugin host do you use?
Ardour primarily. When using Dragonfly within Carla I have zero issues - but I also don't run a pure wet signal in Carla either.
What CPU do you have?
Thanks for putting in the time to track this down.
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Re: Dragonfly Reverb Bug

Post by Michael Willis »

uns4ph3 wrote: Tue Dec 08, 2020 2:42 am Then suddenly, every single project with a purely wet verb would peak the meter
Hey @uns4ph3, please try the new version 3.2.3 that was released today, I think it will likely fix this bug.
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