Propellerhead Reason - 4.0 Instrukcja Operacji Pobierz pdf (Strona 210)

THOR POLYSONIC SYNTHESIZER

208

D There are 32 wavetables that can be selected using the up/down buttons

or by clicking in the Wavetable display.

Some of the wavetables have waveforms that sequentially follow the harmonic series,

i.e. each following waveform adds a harmonic. Others have waveform series that pro-

duce a sound similar to oscillator sync when swept, and other wavetables are simply

mixed waveforms. The last 11 wavetables are based on wavetables used in the origi-

nal PPG 2.3 synthesizer.

Phase Modulation oscillator

The Phase Modulation oscillator is inspired by the Casio CZ series of synthesizers.

Phase modulation is based on modiulating the phase of digital waveforms to emulate

common filter characteristics.

D You have a First and Second waveform which can be combined. Instead

of mixing the two waveforms they are played in series, one after the

other.

This adds a fundamental one octave below the pitch of the original sound.

D The PD parameter (Mod) changes the shape of the wave, much like a fil-

ter does.

The following waveforms (sequentially from the first) are available as the First wave-

form:

• Sawtooth

• Square

• Pulse

• Pulse and Sine

• Sine and flat (half sine)

• Saw x Sine

• Sine x Sine

• Sine x Pulse

The last three waveforms could be described “resonant”, as these originally were

meant to simulate filter resonance. They didn’t really do this very accurately, but nev-

ertheless constituted an important part of the sound.

The Second waveform has the same available waveforms except the last three, and it

can also be bypassed altogether. You can combine waveforms freely, except it is not

possible to combine two “resonant” waveforms.

FM Pair oscillator

As the name implies, this oscillator generates FM, where one oscillator (Carrier) is fre-

quency modulated by a second oscillator (Modulator). Although very simple to use

(unlike most hardware FM synths), this oscillator can produce a very wide range of FM

sounds.

D The Carrier and Modulator selector buttons set the frequency ratio be-

tween these two oscillators (the range is 1-32).

The frequency ratio is what determines the basic frequency content, and thus, the

timbre of the sound.

D The FM knob sets the amount of frequency modulation.

This is also the Modifier parameter. If FM amount is set to zero, there is no FM and

the output will be a pure sine wave.

• If you set FM Amount to zero and step through the values of the Carrier oscillator,

you can hear that the pitch is changed according to the harmonic series.

• Stepping through the Mod oscillator values will change the pitch in the same way,

although FM Amount has to be set to a value other than zero to be able to hear it.

Thus, 2:2 is the same wave shape as 1:1 but one octave higher in pitch, 3:3 is the

same wave shape as 2:2 but a fifth higher in pitch and so on.

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