SH-201

Synthesizer

Q.What does the "FILTER" section on the SH-201's front panel do?

A.The SH-201's FILTER section allows you to control the brightness, thickness, and overall tonal character of the sound. This is accomplished by adjusting a "cutoff frequency," whose behavior is determined by a "filter type" and "slope" setting.

Related FAQ:
I often heard the term "filter" when talking about synthesizers, but what does the "filter" mean?
Following are descriptions of the FILTER section's controls:

TYPE Button

    The TYPE setting determines the behavior of the CUTOFF knob. Repeatedly pressing the TYPE button successively cycles you through the settings in this order: LPF -> HPF -> BPF -> BYPASS -> LPF ->…



  • LPF (Low Pass Filter)
    This setting cuts the frequency region above the cutoff frequency, making the sound progressively more mellow as the cutoff frequency is lowered. This is the most commonly used filter-type.
  • HPF (High Pass Filter)
    This setting cuts the frequency region below the cutoff frequency, emphasizing the high-frequency region. For example, you can use this when you want to create percussion instrument sounds with a distinctive high range.
  • BPF (Band Pass Filter)
    This setting passes only the frequencies in the region of the cutoff frequency, and cuts the remaining frequency regions. You can use this to create distinctive sounds. For example, if you select BPF when you've selected "NOISE" as the OSC waveform, you will hear only a limited region of the frequency components of the noise waveform; this lets you play "noise" notes that have a sense of pitch.
  • BYPASS
    Bypasses the filter. The unfiltered waveform of the oscillator will be output.

SLOPE Button

    The SLOPE setting determines the slope (steepness) of the selected filter.
  • -12 dB
    At this setting, the filter slope is gentle, allowing some of the sound near the cutoff frequency to remain.
  • -24 dB
    At this setting, the filter slope is steep, cutting most of the sound immediately above and/or below the cutoff frequency (depending on the TYPE setting).

CUTOFF Knob

    This knob specifies the sound's cutoff frequency.
  • When TYPE is set to "LPF"
    turning the knob clockwise brightens the sound, while turning it counter-clockwise darkens the sound.
  • When TYPE is set to "HPF"
    turning the knob clockwise makes the sound lighter (less thick), while turning it counter-clockwise makes the sound heavier (thicker).
  • When TYPE is set to "BPF"
    turning the knob clockwise allows a higher range of frequencies to be heard, while turning it counter-clockwise allows a lower range of frequencies to be heard.

RESONANCE Knob

    Turning this knob clockwise boosts the sound region near the cutoff frequency, adding a distinctive character to the sound.

KEY FOLLOW Knob

    The setting of this knob causes the cutoff frequency to change according to the key you play. Positive (+) settings cause the cutoff frequency to rise as you play higher on the keyboard, while negative (-) settings cause the cutoff frequency to fall as you play higher on the keyboard. At the center position (0), the cutoff frequency is not affected by the keys you play.

When TYPE is set to "BYPASS," KUT-OFF / RESONANCE / KEY-FOLLOW knob
has no affect on the sound.

(2006/03/07)

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