Filter Section - Roland S-1 Owner's Manual

FILTER section

The FILTER section is used for reducing or emphasizing harmonic components in the original sound that's mixed in the OSC
section, and to alter the tone.
This lets you pass the lower frequencies through while cutting the higher frequencies (LPF: Low-Pass Filter).
[FREQ] knob
This knob sets the cutoff point (cutoff frequency) for the filter.
Turning the knob counterclockwise cuts the higher frequencies and makes the waveform closer to that of a sine wave. At the
minimum setting, there is no sound.
[RESO] (Resonance) knob
Emphasizes the frequencies around the cutoff point that you set using the [FREQ] knob.
Turning the knob clockwise emphasizes specific harmonic components, adding character to the sound.
In particular, when you move the cutoff point while the resonance is raised, you can get a sound that's unique to synthesizers.
Also, if you raise the resonance to maximum, the filter oscillates at the cutoff point.
[LFO] knob
This adjusts the intensity (depth) when controlling the filter's cutoff point with the modulator signal from the LFO section.
The method of change for the cutoff point depends on the setting of the [WAVE FORM] knob in the LFO section.
[ENV] (envelope depth) knob
This adjusts the intensity (depth) when controlling the filter's cutoff point with the envelope generator's signal.
Turn the knob clockwise to change the filter cutoff point according to the ADSR pattern (the combination of settings for the four
knobs in the ENV section), which you set beforehand for each note you play.
Use this to make changes in the sound over a short time within single notes.
Changing the cutoff point according to the pitch (FILTER KYBD: filter keyboard
follow)
This parameter adjusts the intensity (depth) when controlling the filter's cutoff point with the pitch signals generated by the
keyboard.
By making the cutoff point follow the pitch of the notes played, you can keep the same harmonic components.
For instance, when you play a high note while the cutoff point is set to a lower frequency range, the cutoff point doesn't change
even when the fundamental frequency changes, thus creating large changes in the sound.
If you don't want this to happen, increase the filter keyboard follow value.
1. Hold down the [SHIFT] button and press pad [7] (FILTER KYBD).
2. Turn the [TEMPO/VALUE] knob to edit the value.
Value Explanation
Changes the filter cutoff point according to the notes played on the keyboard.
0–255 Larger values make the harmonic components change less in response to the notes you play.
A value of "255" makes the cutoff point perfectly follow the pitch.
Creating sounds
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