When trying to load an instance of Cytomic's The Glue compressor openmpt (tested on 2.45 and 2.52) tells me it isn't a valid VST.
I posted on KVR to see if others were having problems as well, and Andrew Simper (the developer of the plugin) told me the plugin is VST2.4 and the host needs to be able to handle 4 in 2 output plugins.
So i'm guessing mpt has either a problem with VST2.4 or a problem with 4 in 2 outputs.
He also said the following:
"Please let the your host developer know that they can contact me ( www.cytomic.com/contact ) if they require any help in supporting vst 2.4 speaker negotiation, it shouldn't take long code the support for it.
Andrew Simper"
http://www.kvraudio.com/forum/viewtopic.php?p=3754036
So if anyone wants to have a look at it that'd be awesome.
I think OpenMPT supports the VST specs up to v2.3, so it would be only natural that the plugin doesn't work correctly. ModPlug also doesn't have a bus and only supports 2 inputs (stereo). I'm afraid you can't use sidechain compressors in OpenMPT directly.
I remember using compressors that had sidechaining as well, they worked fine except you couldn't use sidechaining (obviously), but that might be because of different programming by the dev.
Are there any plans on implementing the VST 2.4 specs?
Sorry, those two explanations were not related. Sidechaining isn't new in the 2.4 specs, but this compressor seems to make use of additional new features. I won't be the one who adds support for VST 2.4, so I cannot say if there is a plan on implmenting it.
Actually the plugin loads fine here in any version of OpenMPT I've tried (1.17.02.54 and newer). That doesn't mean that sidechaining will work, but that's a different story anyway.