The filter section of the POLYMORPH
Initializing to a neutral single sound
For the following example with the filters of the POLYMORPH, create a light sustained sound
initially:
1.)
Push [WRITE].
2.)
Select menu page 4 with [PAGE < >]. This appears:
<4> Init Sound?
[ok]
3.)
Initialize with the help of [F1].
4.)
Leave the write menu with [EXIT].
5.)
Now when you play on the keyboard you hear a very boring simple tone.
6.)
Regulate <LEVEL-1> to 0 and <LEVEL-2> to 127. Now you only hear oscillator 2.
7.)
Select sawtooth2 as waveform for this oscillator.
Now everything is prepared for the filter examples.
First filter experiments
The best way to discover the reaction of the sound to a filter is to play around with it. The prior
basic settings that were made suits this perfectly. Play a continuous tone and turn on the control of
the low-pass filter only. Do not adjust the <ENV-MOD> and the envelope parameters at this time.
A good exercise is to test the effects of the <LP-CUTOFF> with different resonance settings. You
will notice that the sound changes become more drastically audible with the resonance adjusted
up.
Directly beneath the <LP-CUTOFF> you find [LP24dB]. With this switch you can change the filter
characteristics of the low-pass filter back and forth between 12 and 24 dB. With a higher
resonance setting it is easier to hear the difference in the sound. Depending on the sound
character you want you can use the 12dB filter or the 24dB filter. The LPF filters the treble out of
the sound, but passes the low frequencies intact, hence the name.
Next set <LP-CUTOFF> to 127, <LP-RESONANCE> to 0 and go to the high-pass filter. The
high-pass filter only lets frequencies through that are above the cutoff frequency. The high-pass
filter has a rolloff curve of 12dB per octave. Now turn the <HP-CUTOFF> to cut off the frequency
spectrum at the bottom. You can experiment with the resonance values, to change the character of
the filter effects.
Filter menu
FILTER ROUTING: MENU PAGE 1
If you find yourself in another edit menu, push [EXIT] twice. Push [EDIT] to get in the edit menu.
Press [PAGE<>] to select page 2. The display shows:
Select Edit <2>
[FILTER] [AMP]
Push [F1]to reach the filter edit menu. The display indicates the first menu page of the filter menu:
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The Synthesizers of the POLYMORPH
