feeder_getclass
struct feeder_class *feeder_getclass(u_int32_t type);
fc = feeder_getclass(FEEDER_FORMAT);
fc = feeder_getclass(FEEDER_RATE);
fc = feeder_getclass(FEEDER_MATRIX);
fc = feeder_getclass(FEEDER_VOLUME);
fc = feeder_getclass(FEEDER_EQ);
fc = feeder_getclass(FEEDER_ROOT);
fc = feeder_getclass(FEEDER_MIXER);