REGISTER_FILTER(CONCAT, concat, avf);
REGISTER_FILTER(SHOWCQT, showcqt, avf);
REGISTER_FILTER(SHOWSPECTRUM, showspectrum, avf);
+ REGISTER_FILTER(SHOWVOLUME, showvolume, avf);
REGISTER_FILTER(SHOWWAVES, showwaves, avf);
REGISTER_FILTER(SHOWWAVESPIC, showwavespic, avf);