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The Oscillator Section > Oscillator 1 - Pg. 200

12dB Low Pass--Also called LP 12, this filter is similar to the 24dB low pass, but the roll-off curve is not as steep, because it has a range of 12 decibels per octave. This makes the LP 12 a perfect solution for creating a filter sweep that is low, but not low enough to blow up your speakers. 24dB Low Pass--Also called LP 24, this filter allows low frequencies to pass through, while high frequencies are filtered out. To top it off, this low pass filter has a very intense roll-off curve (approximately 24 decibels per octave), which produces a greater emphasis on the low frequencies. The Filter Frequency, or cutoff filter, as it is also called, is used to specify where the filter will function within the frequency spectrum. It is a very popular parameter used to create the "sweeping" effect that often occurs in electronic music. When the frequency is used to alter a filter, it opens and closes the filter within a specific frequency range. In order to better understand what the Filter Frequency does, try the following exercise. 1. 2. Load a PolySynth patch from the Reason Factory Sound Bank. Try the Analog Brass patch, which is located in the PolySynth folder. The Filter is already activated. Set the Filter mode to the LP 24 setting and make sure the Resonance slider is set to 0. Also make sure the Filter Frequency slider it set to its maximum setting of 127. Arm the Subtractor sequencer track to receive MIDI and play a sustained chord with your left hand. With your right hand, click on the Filter Frequency and drag the control down, so you can hear the filter close as it decreases in value. Once the Filter Frequency is set to 0, all of the high frequencies have been filtered out. Try this same exercise with other filter modes, such as the Notch or Band Pass, to hear the effect. 3. The Resonance slider is used in combination with the Filter Frequency. It emphasizes the frequencies set by the Filter slider, which thins the sound out but also increases the sweep effect mentioned earlier. In order to better understand how the Resonance slider works with the Filter Frequency, try the following exercise. At the far right of Filter 1 is the Keyboard Tracking knob. It can be used to bring the higher notes to the forefront in a mix. Filter 2 Filter 2 brings an additional 12dB Low Pass filter to the table. Although it might not have all of the bells and whistles that Filter 1 has, it can produce many interesting timbres that are not possible with most hardware-based synths. To activate Filter 2, just click on its power button. Once this is done, the outputs of Filter 1 are virtually routed through Filter 2. Filter 2 can be used in two ways: The Frequency slider of Filter 2 can be used independently of Filter 1, meaning that any changes you make to this parameter will only affect Filter 2. The Frequency slider of Filter 2 is linked to the Frequency slider of Filter 1, meaning that any changes you make to this parameter will affect both Filter 1 and Filter 2.