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IDProjectCategoryView StatusLast Update
0005922ardourbugspublic2014-05-06 20:35
Reportercpb Assigned To 
PrioritynormalSeverityminorReproducibilityalways
Status confirmedResolutionopen 
Product Version3.0 
Summary0005922: Mono audio is only routed to the left channel of a MIDI input supporting stereo VST plug-in
DescriptionWhen routing a mono audio track to a stereo VST plug-in insert, only the left channel receives the audio if the plug-in has a MIDI input. It appears that the MIDI input confuses the Match (Split) detection in PluginInsert::private_can_support_io_configuration .

To reproduce, from a new project:
- Add a mono audio track, and import a mono audio file into it
- Add a MIDI input consuming stereo Linux VST plug-in to the channel route. Either Illformed's Glitch (http://illformed.org/plugins/) or Loomer String FX (http://www.loomer.co.uk/downloads/String/String.tar.gz) are suitable to prove this.
- Play the session. Notice that the audio emerging from the plug-ins only appears in the left channel of the track.

A stereo Linux VST plug-in without a MIDI input port (such as LinuxDSP's Dyn4000) will be inserted in a mono-stereo configuration, as expected.

The way I expect this should work is that stereo plug-ins which consume MIDI input should be able to be Split routed in the same fashion that are plug-ins without MIDI input.
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Leatuspenguin

2014-05-06 20:35

reporter   ~0015782

I can confirm this issue. I have this problem with both Loomer Resound and StringFX, both of which are vst plugins that have a midi input.

Issue History

Date Modified Username Field Change
2014-05-01 23:05 cpb New Issue
2014-05-06 20:35 Leatuspenguin Note Added: 0015782
2014-05-06 20:35 Leatuspenguin Status new => confirmed