User Manual

SPECTRALIS 2

output. For the multimode-filter only the signal-path to the 24dB lowpass is

open. In order to route the multimode-filter directly to the output as well, you

will have to open the encoders to the right of this module as shown in the

drawing. At the same time you should reduce the signal feed level from the

multimode to the 24dB lowpass-filter. You have located the problem! To change

the routing as described, first push the (CutOff MM)-encoder button. You

should see the following menu:

1/8:Multimode: Cutoff Modulation LFO

FmWve:0 FmRte:0 FmDpt:0

We don’t want to spend a lot of time here, so please push the [Page-Up]-button

a couple of times which will get you directly to menu-page 6

6/8:Multimode: Output Volumes

BusV:0 Pan:<0> FB:0 LP:255

Let’s set the bus-level to a value of 230, Pan to center and the encoder LP to 0.

6/8:Multimode: Output Volumes

BusL:230 BusR:230 FB:0 LP:0

You will now hear the multimode-filter always – even when the 24dB lowpass

filter is connected. Both filters are now set to operate in parallel mode.

We’re hopeful that you are developing a feel for the inner workings of the

Spectralis by now. In that case you should not find it difficult to make the

multimode-filter audible by itself. There are two ways to achieve that goal.

You can either set the oscillator level for the 24dB lowpass-filter to 0 or you

can set the sum-out level of the 24dB lowpass filter to 0. The second choice

appears to be the more sensible one, as it requires fewer parameters to be edited

to accomplish the goal and also because you stand to get a better signal/noise

ratio by simply removing an analog filter not being used from the sum-out.

Operation is very simple. You probably still remember which menu-page

provides the needed parameters.

Simply push the (CUTOFF LP)-encoder button and dial up menu-page 6 ”LP

Feed” via the [Page-Up]-button. You can now lower the output level of the

24dB lowpass filter, allowing you to hear the multimode filter by itself.

This would be the perfect time to extensively test the multimode-filter. Contrary

to the multimode-filters of the DSP section this analog version has a number of

additional features. For instance you can not only toggle the different filter-

outputs, but you can also route the various filter-types simultaneously to the

output. Any activated output will light up the corresponding button [12dB LP],

[12dB HP] and [12dB BP]. You can now try out the various filter-types, change

the cutoff-frequency (CUTOFF MM) and the resonance (RESO MM) and

hopefully memorize the effect of the various settings.

Hybrid engine - Multimode-filter and filter-routing