Owner manual

A-104
Trautonium Formant Filter
System A - 100
doepfer
4
Fig. 2: Frequency response of band pass and low
pass
2 Freq.
Control
2
is used to adjust the
filter frequency
(see
fig. 2):
• In band pass mode i.e. the middle frequency f
M
• In low pass mode i.e. the cutoff frequency f
C
The frequency range for each filter is about 50Hz ...
5kHz (same as for the Trautonium filter).
3 Resonance
Control 3 is used to adjust the filter resonance (or
emphasis or Q, see fig. 2):
•
In band pass mode i.e. the band width
•
In
low pass
mode i.e.
frequency emphasis
around the cutoff frequency
Self-oscillation - as for some other filters of the A-100
(e.g. A-120, A-121, A-122, A-123 and so on) - is not
available.
4 Mode
The three-position switch
4
is used to select the
mode
of the corresponding filter:
• band pass (upper position)
• off (middle position)
• low pass
(lower position).
5 Level
Attenuator 5 is used to adjust the signal level of the
corresponding filter (share in the mix output socket
"
).
Frq.
Freq.
Out
Frq.
Res.
Freq.
Res.
Out
f
C
f
M