| has gloss | eng: Some cassette decks have an MPX filter, which is effectively a notch filter that will block the 19 kHz guard tone. You should be able to hear the difference by recording from an FM stereo source and engaging and disengaging the MPX filter switch (on a three-head deck with monitoring, you will be able to hear this while recording). The filter should not be engaged when recording from other sources, such as Compact Disc. The setting of the switch should have no effect during playback. |