Roland SH-201 Turn this knob as you play, Press this button to select LPF, One o’clock position

The Function of Controls 2

Chapter4 FILTER

The sound signal generated from the OSC is processed through the filter, which can emphasize and reject

a selected frequency range. The filter can affect

and change the sound’s brightness, boldness, and more.

P ress the [TYPE] button and select LPF(*1). The LPF controls the amount of high frequencies that pass through. Thus, it has no effect on sounds in the low frequencies.

N ext, turn the [RESONANCE] knob. Turn it all the way left (MIN), then gradually rightward to (MAX). It will start to resonate, yielding a colorful, howling sound.

If you turn the knob far too right, you will hear an ear-piercing, high-pitched sound. This sound is generated from the filter itself. If you continue to play the keyboard in this manner, you will realize that the filter-generated sound is completely independent of the waveforms and pitches generated by the OSC (oscillator).

level

Turn this knob as you play

Now, set the RESONANCE knob to the “one o’clock” position.

Press this button to select LPF

frequenices that are cut

frequency

LPF

One o’clock position

On a piano, its initial sound would

Set the FILTER ENV sliders in this manner

T urn the [CUTOFF] knob as you play. Slowly turn it counter clockwise from all the way right (MAX) leftward to (MIN). The sound will gradually muffle during this process, and when it is turned left all the way, most of the sound becomes inaudible. This is due to the fact that most of the sound frequencies have been filtered out and rejected.

level

frequenices that are cut

frequency

include most of the harmonics that generates bright sound. Afterward, the sound would fade gradually,

as a decrease in harmonics will result in a dull (dark) sound. To re-create this phenomenon, create a time-varied effect with the filter. In other words, the operation of turning the [CUTOFF] knob becomes automated as you play the keyboard.

and play the keyboard.

cutoff frequency
S(=0)	DEPTH

	DEPTH				time
D	(+)	A	D	R(=0)
	A

Chapter

4

The Function of Controls

MINMAX

Turn this knob as you play	First, set the [CUTOFF] knob
	to the “two o’clock” position.

Two o’clock position

L astly, turn the [KEY FOLLOW] knob. Turn it right all the way to the (+) position; the low frequencies become softer,

and the high frequencies become brighter inversely. Try setting the knob at different positions, and play the keyboard to hear what it does.

Turn this

knob as you play

When you are finished, turn the knob all the way to the (+) position.

11

Next, let’s go to the “AMP”, where the initiation and termination of the sound are determined.

(*1) Low Pass Filter

12