Stereo plugin into Mono track loses audio signal

#1

Hello, I am having an issue with the latest version of Ardour 8.12 on Windows.

I reopened a project that I made with a previous Ardour 8 version, and all my mono tracks which contained stereo-capable plugins stopped playing any sound. (mostly using ‘Raum’ from NI)

It was never a problem before to add ‘Raum’ or any other plugin into a mono track.

I can recreate this behaviour by creating a mono track and adding an VST3 instance of ‘Raum’.

The weird part is that when I remake the exact same connection in the ‘Pin Configuration’ window of the plugin, it works again.

Here is a video demonstrating it:

Did anyone experience similar behaviour, since updating? I do not remember changing any settings that could influence this

#2

This is odd, there have not been any changes to Ardour that would explain why it worked before. Have there been any other change? A Raum.vst3 update?

It looks like Raum VST3 was intended to remain silent if initially only one if its inputs is connected. We know of a couple of VST3 plugins that only work when both inputs are connected (almost all other DAWs always run VST3 in stereo).

Perhaps just disable strict-i/o [1] for the track, or create new tracks directly using flexible-I/O.

Alternatively I suggest to use a Stereo Bus for Raum and aux-sends to the bus, which is a nicer workflow for reverbs ot begin with

[1] The Ardour Manual - Track/Bus Signal Flow

#3

I have noticed on some occasions, a plugin that was updated by the developer may need a rescan in Ardour to function properly again.

Maybe , in Ardour plugin manager, rescan Raum and see if that works.

#4

Thanks for your insights, it is likely due to the plugin yes. I probably updated it but I do not remember.

Using the VST2 version of the plugin does not have the issue.

Using Flexible I/O does not resolve the issue unfortunately.

Yes using a bus is better in that case probably anyways, but the issue occurs on all sorts of plugins which I need on my tracks directly.

I guess it is an issue on NI’s side, it is kinda annoying but as a workaround I will use stereo tracks.

Thanks for your help

#5

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