Korg MICRO manual Filter KEY Track, 12dB BPF, 12dB HPF, Filter oscillation

6.FILTER — SYNTH

TYPE

-12dB BPF ():

-12dB/oct BPF (Band Pass Filter) allows a frequency band in the re- gion of the cutoff frequency to pass, and cuts the remaining frequencies. It is used when you wish to empha- size only a specific portion of the frequency range.(➝ Figure 6-2)

Use this when you want to empha- size just a specific region of the sound. For example, you can use this to create a bandwidth-limited sound similar to sound heard from a small radio or a telephone.

-12dB HPF ():

-12dB/oct HPF (High Pass Filter) allows frequencies above the cutoff frequency to pass, and cuts the lower frequencies. Use this when you wish to make the sound thin- ner. However if the cutoff frequency is raised excessively, the volume will decrease significantly. (➝ Fig- ure 6-3)

For example you can use the HPF to purposely attenuate the low-fre- quency region of a sound that will be played together with other low- frequency instruments, in order to differentiate that sound from the other instruments.

Figure 6-2

BPF (Band Pass Filter)

Frequency

Cutoff

Figure 6-3

HPF (High Pass Filter)

Frequency

Cutoff

Filter oscillation

If you raise the resonance to a high value, it will oscillate (produce a sound) at the frequency specified by the cutoff frequency. You can use filter oscillation ("self-oscillation") as a sound source. If the filter is

Figure 6-5

Cutoff

Figure 6-6

Cutoff

Cutoff frequency specified by “Cutoff”

FILTER KEY TRACK

Keyboard Track operates ac- cording to the pitch that is con- trolled by pitch bend, and trans- pose. It is not affected by pitch changes produced by vibrato or Virtual Patch.

Note on			Note off
		Sustain Level
Attack		Decay			Release Time
Time		Time				Time
	Int=+32			Int=+63
Note on		Note off	Note on Note off

Int=0

Time

oscillating, the "CUTOFF" parameter that normally adjusts the tone will instead control the pitch of the oscillation. This can be used in a variety of ways. Whistling is a typical example, and can be produced by adjusting the ADSR parameters of the filter EG. You can also try setting "FILTER EG INT" to a negative value. Another possibility is to select the MOD wheel or LFO 1/2 as a source in Virtual Patch, and use it to control "CUTOFF" as a destination.

Figure 6-7	Cutoff
Cutoff frequency			Int=–32		Int=–63
						Int=0
specified by
“Cutoff”
			Note off
				Note on Note off
		Note on
							Time

25