66
SPECTRALIS
How to...? The fixed filterbank
just push it once more. Encoders 1-10 are now assigned to the level of the individual
frequency-bands. If you set all filter levels to 0 beside the lowpass filter and if you
rise up the volume for the LP-filter output to a high volume, the sound engine should
produce a low rumbling noisefloor, in case you have a speaker-system that is capable
of reproducing such low frequencies. In case you are not hearing anything, please
check the routing once again. Turn the encoder
[12]-[15]
to a value of 0 and turn the
filterbank direct volume to a value of about 200 using the encoder
[11]([FB Level])
.
Now create a frequency band mix with encoders 1-10. Once you have set up a nice
sounding spectral mix push one of the control buttons
(1)-(10)
to open the filterbank
edit menu.
1/2:Filterbank Configuration
Morph:0 FBBP:255 FbQ:0 FbFs:0
You have the following parameters available in this menu:
Morph:
Using just this one control you can change the progression of the volume envelope
for the two filterbank outputs R and L. On the next menu-page the envelope will
be available for editing with the obligatory attack, decay, sustain and release
parameters.
FBBP:
This is the previously mentioned bypass-control, which allows you to pass the
filterbank signal through an additional envelope controlled amplifier. This menu-
entry is definitely the most important one in the filterbank menu if you start routing
external signals into the filterbank. For that process you should definitely turn up
the bypass control so that you can hear the external signal even if the analog-part
is not being played. More about this in a chapter later on. Turn this encoder up for
the upcoming experiments, to ensure constant sound from the filterbank output.
FbQ:
This parameter changes the resonance of all filterbands. It changes the sound of
the filterbank quite dramatically – just turn the encoder and hear for yourself how
much the noise-mix can be twisted around.
FbFs:
The individual filterbands of the filterbank consist of cascaded filterstages. The
bandpass-filter response curve - which is the result of all cascaded filters – can
be changed by adjusting the frequencies of the cascaded stages. This parameter
decreases the lower stages frequency and increases the higher stages frequency .
By using both parameters – quality and spread of the partial bands – it is possible
to vary the soundcharacter of the filterbank substantially.
Summary of Contents for Spectralis
Page 1: ...1 SPECTRALIS Spectralis...