static Vamp::PluginAdapter<ZeroCrossing> zeroCrossingAdapter;
static Vamp::PluginAdapter<SpectralCentroid> spectralCentroidAdapter;
static Vamp::PluginAdapter<PercussionOnsetDetector> percussionOnsetAdapter;
static Vamp::PluginAdapter<AmplitudeFollower> amplitudeAdapter;
static Vamp::PluginAdapter<ZeroCrossing> zeroCrossingAdapter;
static Vamp::PluginAdapter<SpectralCentroid> spectralCentroidAdapter;
static Vamp::PluginAdapter<PercussionOnsetDetector> percussionOnsetAdapter;
static Vamp::PluginAdapter<AmplitudeFollower> amplitudeAdapter;