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Chapter 3: Basics of Analog Synthesis
ANDROMEDA A6 REFERENCE MANUAL 89
3. As the keyboard is played, low notes output low frequencies from the
oscillators and high notes play high frequencies. Similarly, the filters can be
scaled as well. So it makes sense that the keyboard control be routed to the
filters so that low notes played on the keyboard cause the filter to “close” and
output fewer harmonics; high notes on the keyboard cause the filters to
“open” and output more harmonics. This type of scaling causes notes across
the keyboard to have an even amount of brightness:
4. Envelope modulation is introduced into the signal flow so that the harmonic
content (the envelope modulating the filters) and the overall loudness (the
envelope modulating the output section) of the sound can be shaped. This
shaping is controlled by you as you set the envelopes’ time and amount
parameters.