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Wave

A wave is the digitally stored image of a single wave cycle. From this point of view a wave

is identical to a sample that is looped exactly after one cycle. The difference to a sampler or

ROM sample player is that all waves have the same length and they are played at the same

pitch. A typical wave looks like this:

The diagram shows the symmetry of the waveform which is mirrored in its middle. In fact

most waves in the MicroWave II/XT/XTk are made up in this way so that only the first half

of the cycle is stored in memory. The MicroWave II/XT/XTk calculates the missing part on

its own. At this point we see one extension to the classic PPG systems and the first

MicroWave: The MicroWave II/XT/XTk can also store whole wave cycles. This feature

becomes interesting in all those cases where analog-type waveforms with different pulse

width or additive created waveforms with different phase shifts of the harmonics should be

generated. These sophisticated timbres were especially not realizable with the first

generation wavetable synthesizers.

Wavetable

In fact a wavetable does not consist of waves but of references to them. The MicroWave

II/XT/XTk stores wavetables and waves separately, numbered from 001…128 for the

wavetables , 000…299 for the waves and 1000…1249 for the user waves.

In a wavetable up to 64 of these references are combined, each pointing at one of the 500

waves. The term "up to 64" means that a wavetable can contain even less references. In this

case the missing entries are filled automatically by the MicroWave II/XT/XTk as soon as the

wavetable is selected. At least 5 references must be present in every wavetable, one at the

first position and 4 at the last. Three of the four positions represent – as already described

above – the classic synthesizer waveforms triangle, pulse and sawtooth.

E.g. the wavetable shown below contains references to waves at positions 00, 02, 05, 60

plus the three classic waves at positions 61…63. We will ignore these three last ones for

now.

Wave 63

Wave 62

Wave 61

Wave 60

Wave 05

Wave 04

Wave 02

Wave 01

Wave 00

Wave 03

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Waldorf MicroWave XT Bedienungsanleitung Seite 35