Mention
has already been made of the fact that conventional instruments exhibit
more `life' and variation in tonal character than electronic instruments
due to the way in which they are played. For example, string instruments
and woodwind instruments can exhibit marked tremolo and/or vibrato due
to variations in the bowing or blowing. The keyboard of a synthesiser
provides a relatively inflexible and expressionless means of playing
that does not allow these nuances to be introduced into the sound, and
in order to make the sound more `lively' amplitude and frequency modulation
must be introduced using LFOs and noise sources.
The LFO module described here provides two low-frequency waveforms.
Specifications:
- Frequency (Square & Triangle) - <0.01Hz - >20Hz
Outputs:
- Square and Triangle outputs - 10V peak-to-peak centred around 0V