Waldorf MicroWave XT User Manual download pdf (Page 36)

Now imagine an oscillator sweeping through these wavetable to play one of the waves:

• When position 00 is selected, the oscillator plays the wave referenced by the

wavetable.

• When position 01 is selected, the oscillator plays a wave which is calculated by

the MicroWave II/XT/XTk without being stored in memory directly. The shape of

this wave is interpolated between the shapes of the previous and the next existing

wave, both mixed with different amplitude settings. In the given example a wave

with an amplitude relation of 50% to 50% from the waves on position 00 and 02

would be the result.

• When position 02 is selected, the MicroWave II/XT/XTk plays a "real" wave again,

the one referenced by the list position.

• Position 03 and 04 work similarly to position 01. Again, the waves to be played are

calculated by the MicroWave. In this case the gap is bigger because two positions

in the wavetable are empty. As a result a wave mix of 2/3 to 1/3 (i.e. approx. 66%

to 33%) is generated for wave position 03. As you can see, the previous existing

wave is more weighted here. At position 04 the calculation works vice versa, i.e.

1/3 of wave 02 amplitude and 2/3 of wave 05 amplitude.

• On position 05 a stored wave is played again.

If the oscillator would move up and down between positions 02 and 05, a continious

change of the timbre would be noticed. It is a little bit oversized to call this "continuous"

when not more than 4 positions are available but imagine no further wave references are

stored between position 05 and 60. Then you will get a very smooth timbre change by

moving from position 05 to 60.

And what about hard timbre changes? Now take a look at the classic waveforms on

positions 61…63. As there are not any blank positions between these waves the resulting

timbre changes are very hard.

What else can we do?

In addition to the described structure, the MicroWave II/XT/XTk can generate wavetables

and their corresponding waves via mathematical calculations. Such wavetables are called

"algorithmic wavetables". The speciality about these wavetables is that they don’t need any

real waves to generate interesting timbre changes.

E.g. the calculation scheme for an algorithmic wavetable can be as follows: Take a pulse

wave for position 00 and remove the last samples for every step, so that a single sample

remains on position 60. The result is a wavetable with pulse waves of different pulsewidth.

The different base algorithms for such wavetables are:

• synchronisation

• pulse width modulation

•FM

• waveshaping

Further information regarding algorithmic wavetables is available via internet:

ftp://ftp.waldorf-gmbh.de/pub/waldorf/microwave/upaw/

Summary

You should keep the following sentence in mind because it describes the essentials of the

wavetable synthesis:

User’s Manual MicroWave II • MicroWave XT • XTk

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 125 126

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Waldorf MicroWave XT User Manual Page 36

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