Horst MIDI Wave-Theremin MWT-01 Manual page 12

The A/B Switch: With the 'A/B switch' , we can toggle between 2 different
settings of a particular instrument (3 oscillators each). If for example we
select position A and we turn only the volume of the main oscillator up
(oscillator-2 and oscillator-3 volume to zero) then we would have created a
simple sine wave Theremin sound at instrument 'Sine A' for example.
If we then switch to 'Sine B' with the A/B switch, we may decide to have
oscillator-1 at full volume and add a small amount of oscillator-2 and
oscillator-3 volume as well. We now hear 3 sine-waves when we play the
Theremin. Each of the oscillators can be individually panned in the stereo
field (left to right) to create a broader sound image (panorama sound).
Wave Oscillator Pitch: The frequencies of wave oscillator-2 and -3 are
'ratios' of the frequency of the main wave oscillator-1. This means
whenever we change the frequency of oscillator-1, the frequency of
oscillator 2 and 3 will follow according to their frequency-ratio setting.
First Harmonic: If we set the frequency-ratio of oscillator-2 to be 'two
times oscillator-1 frequency' then oscillator 2 acts like the first harmonic of
oscillator 1. If you would choose a random ratio, you are likely to get a more
dis-harmonic effect.
Sub Harmonic: If we set the frequency-ratio of oscillator-3 to be 'half of
the oscillator-1 frequency' then oscillator-3 acts like the first sub-harmonic
of oscillator-1. This would allow you to create a fuller Theremin sound.
Toggeling between A and B would then be like a 'Tone Switch' adding or
removing the harmonics (!). You may decide to set the pitch ratios to
resemble a cord or a more bell like harmonic structure etc....
Oscillator Fade: This is an experimental feature . It allows you to fade out a
particular oscillator with increasing 'frequency' similar to a low-pass filter
but instead of filtering, this is done by controlling the volume of the
oscillator. Try it ... for some interesting sonic textures ...
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