[Ardour-Users] Ardour 3.0 beta 1a - Plugin levels 6dB higher than 2.x

Jörn Nettingsmeier nettings at stackingdwarves.net
Thu Dec 8 08:34:56 PST 2011

On 12/08/2011 03:33 PM, Roger James wrote:
> This may be a feature rather than a bug, but it is puzzling me. I have a
> session set up in Ardour 2.8.11 on Ubuntu 11.10 to do Ambisonic UHJ
> decoding. This uses instances of Tom Szilagyi's IR convolver plugin to
> do the conversion of UHJ to B format. I have duplicated this session
> using Ardour 3.0 Beta 1a. Using exactly the same level settings in the
> Ardour mixer and in the plugins wet and dry settings, the overall level
> coming out of the plugin and showing up in the mixer meters is about 6
> dB higher than that which I get in 2.8.
> Has anyone else observed anything like this? Have I missed something
> obvious in the new UI? Has anyone got any ideas what is going on? It
> just does not feel right to me to have drop the wet level in the plugin
> by -9 db to leave some headroom for the rest of the conversion process.

haven't seen that yet, but i haven't been looking too hard. i've used 
quite a few sessions which have an insert to an external convolver 
(jconvolver in my case), and haven't noticed anything obviously amiss.

as an aside, there is a UHJ decoder in recent releases of fons' AMB 
plugin set. it uses IIR phase shifters instead of FIR hilbert 
transforms, but it works ok and is easier to set up...

btw, i didn't know IR could do 2->3 convolutions - what exactly are you 
doing? UHJ in, WXY out?

> By the way the multichannel export support in 3.0 is awesome for playing
> with Ambisonics etc! Keep up the good work guys.

it is :) i've been whistling happy tunes ever since i moved over to a3.

Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio)
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