Propellerhead Reason - 4.0 Manual de operaciones descargar pdf (Pagina 213)

THOR POLYSONIC SYNTHESIZER

211

Filter slots

Thor has three open Filter slots, two in the Voice section (which act per-voice) and

one in the Global section which is global for all voices (see “Global Filter slot”).

D You select (or change) filter type for a slot by clicking the arrow button in

the top left corner of a slot.

On the pop-up you can select between 4 filter types and bypass mode. Available

filter types are Ladder LP, State Variable, Comb and Formant, each described

separately below.

The following general rules apply:

D Filters are pre-wired to the Filter Envelope (see “Filter Envelope”).

• Filters 1 & 2 can be used serially (i.e. the output of Filter 1 goes (via the Shaper) to

the input of Filter 2, or in parallel (meaning that one signal goes to Filter 1 and an-

other to Filter 2).

The pre-defined routings of the three oscillators into the Filter 1-2 sections is de-

scribed in the “Basic connections - a tutorial” passage.

Common parameters

As with the open oscillator slots, there are certain parameters which are common for

all filter types.

These are as follows:

D All the filter types have large knobs for the filter frequency (FREQ) pa-

rameter and the filter resonance (RES) parameter.

This works slightly differently for the Formant filter - see “Formant filter”.

D The “KBD” parameter sets how the filter frequency tracks incoming note

pitch data.

Some filter types (Ladder/State Variable/Comb) can “self oscillate” and be used

as extra oscillator sources.

D The “ENV” parameter sets how much the filter frequency responds to the

Filter Envelope.

D The “VEL” parameter sets how much incoming note velocity affects the

Filter Envelope Amount.

In other words, for this parameter to have any effect it requires that the “ENV” pa-

rameter is set to a value other than zero.

D The “INV” button inverts how the filter frequency responds to Envelope

settings.

D The “Drive” parameter allows you to adjust the input gain to the filter.

By driving the filter harder you can add further character to the sound.

D Any parameter settings, as well as any modulation assigned to parame-

ters, will be kept even if you change the filter type.

Ladder LP Filter

The Ladder LP filter is a low-pass filter inspired by the famous voltage controlled filter

patented by Dr. Robert Moog in 1965. The name originates from the ladder-like shape

of the original transistor/capacitor circuit diagram.

The original filter also had certain non-linear characteristics which contributed to the

warm, musical sound it is renowned for. These characteristics are faithfully repro-

duced in the Ladder LP filter.

There is also a built-in shaper in the feedback (self-oscillation) loop. If self-oscillation is

activated (see below), the shaper will distort the sound to produce these non-linear

characteristics. To adjust the intensity of this distortion you use the Drive parameter.

D There are 4 different Filter slopes available; 24, 18, 12 and 6 dB/oct.

24dB slope comes in two different types:

• Type I - The shaper (controlled with the Drive parameter) is placed at the filter out-

put but before the feedback loop.

• Type II - The shaper (controlled with the Drive parameter) is placed at the filter in-

put after the feedback loop.

Note that “Self Osc” (see below) must be activated for the shaper to operate.

D This filter can self-oscillate and will produce a playable note pitch with

high Resonance settings if this is activated.

Self-oscillation can be switched on or off by using the “SELF OSC” button. The

“KBD” knob governs how the frequency tracks the keyboard, turned fully clock-

wise will produce 12 semitones/octave tracking.

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