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FORMANT SHIFT
[0, 1, 2, -1, -2]
Shifts the cutoff frequency of each
band-pass filter of the carrier, in
units of filters.
CUTOFF [-63...63]
This continuously shifts the cutoff
frequency of each band-pass filter
of the carrier.
RESONANCE [0...127]
Specifies the amount of resonance
for each band-pass filter of the car-
rier.
Increasing this value will empha-
size the regions near each cutoff fre-
quency.
6. FILTER — VOCODER
E.F.SENSE [0...126, Hold]
Specifies the sensitivity of the En-
velope Follower for the modulator.
Lower settings of this value will al-
low the attacks of the input signal
to be detected more rapidly.
If you set this to Hold (
), the
character of the signal that is being
input at that moment will be held.
Subsequently, the sound will retain
that character regardless of whether
there is any input.
The signal information that is
maintained in the Hold state can
be saved in the program by writ-
ing the program.
If you set this to Hold when
there is no input signal present,
there will be no output even if
an audio signal is subsequently
input.
This value will automatically be
set to Hold if you press the
FORMANT HOLD key. Hihger
values will retain more of the
sound’s natural decay.
By using "FORMANT SHIFT" (knob 1) and "CUTOFF" (knob 2) to shift the cutoff frequency of each band pass filter of the carrier (the
"synthesis filter"), you can raise or lower the frequency response while maintaining the character of the modulator, thus varying the
character of the vocoder output. Both of these knobs do the same thing, and have the same range. FORMANT SHIFT is indexed to shift
from filter to filter, and CUTOFF is continously variable. In addition, you can use "E.F. SENSE" (knob 4) to adjust the sensitivity of the
Envelope Follower for the modulator, in order to vary the smoothness of the attack and the length of the release for the vocoder output.
"FORMANT SHIFT" and "CUTOFF"
Each parameter allows you to vary the character over a range of two steps
upward or downward (a total of four steps upward or downward when
used together). If both of these parameters are at 0, the character will
match the cutoff frequencies of the modulator band pass filters (the
analysis filter).
Cutoff (range in which BPF 8 will change)
0 +63-63
BPFBPFBPFBPF BPFBPF
BPFBPFBPFBPF BPFBPF
897
897
Frequency
Frequency
Formant Shift:+2
Cutoff (range in which BPF 8 will change)
0
+63
-63
Table 6-1
39
50
65 1
(CH1)
80 2
125 1
(CH1)
3
(CH2)
185 2 4
270 3
(CH2)
1
(CH1)
5
(CH3)
350 4 2 6
430 5
(CH3)
3
(CH2)
7
(CH4)
530 6 4 8
630 7
(CH4)
5
(CH3)
9
(CH5)
780 8 6 10
950 9
(CH5)
7
(CH4)
11
(CH6)
1150 10 8 12
1380 11
(CH6)
9
(CH5)
13
(CH7)
1680 12 10 14
2070 13
(CH7)
11
(CH6)
15
(CH8)
2780 14 12 16
3800 15
(CH8)
13
(CH7)
5000 16 14
6400 15
(CH8)
8100 16
10510
12600
Frequency Band (CH)
[Hz] Formant shift 0 Formant shift +2 Formant shift -2
Although the microKORG's editable
band-pass filter has eight channels,
it internally contains sixteen band-
pass filters. These sixteen filters are
arranged in pairs (a pair for each
channel). Table 6-1 shows how the
frequencies adjusted by "FORMANT
SHIFT" and "CUTOFF" correspond to
the frequencies of the sixteen filters.