Not sure whether this is a 'feature' or a bug, but when a Vamp plugin only has one output, its descriptor is not displayed in the drop-down menu. I can understand that this may be suitable for some situations, but in mine I am packing two plugins together - one that processes in the time domain and the other in the frequency domain. The plugins both have the same name, so the list appears as:
PluginName...
PluginName: Out2...
PluginName: Out2...
Ideally it would read:
PluginName: Out1...
PluginName: Out2...
PluginName: Out2...
Out2 and Out3 are in one plugin (time-domain), with Out1 in another (freq-domain) but they are bundled together.
Tested using Sonic Visualiser 1.9 on Linux 64-bit.
Nobody/Anonymous
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