I downloaded the trial version of Spectro, both VST and AU flavours. When either is invoked it appears in the usual plugin window, but does nothing. I got this info from the writer:
Would it be possible to modify Amadeus so that it can use Spectro?Spectro depends on getting timeline information from the host ... I haven't tried Amadeus, but I know that some audio editors (for example Wavosaur, and older versions of Audition) don't send timeline information to plugins, so Spectro can't draw anything (because even if you did draw a region, there's no way for Spectro to know when to apply that region). It's likely that's the problem with Amadeus too.