[Part 1 briefly reviews the differences between analogue and
digital synthesis, and discusses voltage control - "one of the
major innovations in the development of the synthesizer." Part 2
begins a look at subtractive synthesis with a discussion of
VCOs, waveforms, harmonic content, and filters. Part 3 discusses
envelopes - the overall 'shape' of the volume of a sound,
plotted against time. Part 4 looks at amplifiers as well as
other modifiers, including LFOs, envelope followers,
waveshapers, and modulation. Part 5 shows how a subtractive
analogue synthesizer can be a learning tool for exploring some
of the principles of audio and acoustics. Part 6 considers other
methods of analogue synthesis. Part 7 deals with the topology of
the modules that make up a typical synthesizer and then looks at
categorizing types of synthesizers.] 3.7 Early versus modern
implementations Electronics is always changing. Components,
circuits, design techniques, standards and production processes
may become obsolete over time. This