User Manual

SPECTRALIS 2

3.2.9 Playing filtered sounds

This might be the right time to actually give a first listen to the filters. Use the

[Select]-button in the "Part"-section und chose one of the three DSP synthparts

with the help of the numeric buttons. You can now play this part with your

MIDI-keyboard. Once you’ve selected the part, the encoders of the Spectralis

frontpanel are assigned to the selected synth part. You might want to select a

multi-sample with lots of overtones. Waveform multi-samples like "SFSaw"

or "Puls70" (both part of the downloadable "multis.SLC" soundbank) are

perfectly suited for this task.

Using the buttons [12dBLP], [12dBHP] and [12dBBP] you can activate the

desired filter function. The (Cutoff LP)-knob changes the frequency of the

selected sound directly. When you are activating the filter you will immediately

hear a sound-change, as we have set the filter approximately to a medium

frequency in the factory settings, so there is an audible signal with all filter

functions. When switching on one of the [12dBXX]-buttons you will definitely

be able to hear the sound changes. You should experiment with different

resonance settings to get an idea of the frequency changes possible.

3.2.10 Envelope control of the filter frequency

The envelope allows automatic frequency control of the multimode filter. In order to

make the envelope control of the filter audible, the filter should not be completely

opened. When the envelope amount is set to a positive value and the filter frequency

is already set to it's highest frequency, the envelope will not affect the sound at all.

a.) For your first try use the [12dB LP]-button to activate the lowpass mode.

b.) Set the cutoff-frequency to a value which either will make the sound appear

filtered heavily or not audible at all.

c.) Turn the (EG-Depth)-encoder clockwise, until the envelope control takes control.

d.) Push the (EG-Depth)-encoder-button, to prompt the envelope parameters in

the display. You should see the following menu:

Cutoff Envelope

Att:0 Dcy:90 Stn:0 Rls:90

You can now change the assorted envelope parameters to create the desired envelope

shape for your frequency control.

3.2.11 Filter frequency keyboard scaling

When a Sound is played in different regions of your keyboard, the frequency of the

fundamental and all overtones are being shifted right along. When the cutoff-

frequency is set to a fixed value for the whole keyboard, the resulting tone will

not sound the same in different areas on your keyboard because some transposed

overtones will already be affected by the cutoff frequency setting at higher

notes on the keyboard where the same sound beeing played two octaves down

still is audible with the complete overtone structure. To avoid this from

happening, it is possible to shift the filterfrequency dependent on the MIDI

note number. This kind of control is called ”Keyboard-Scaling”.

Editing DSP-synth sounds - playing filtered sounds