## Sound design using Chaosynth

In this section we briefly discuss the design of the sounds used in Olivine Tress (a piece of electroacoustic music specifically composed using sounds produced by Chaosynth). This is by no means a complete sound design study or composition analysis; our intention here is to introduce the role of the various Chaosynth parameters through some examples.

## The sound design process for Olivine Trees

The sound design process for Olivine Trees is divided into two major steps:

a) the synthesis of the basic sound material, using Chaosynth

b) the transformation and manipulation of the basic sound material, using various sound transformation tools, such as convolution .

We focus here only on the first step; sound transformation and manipulation is beyond the scope of this report.

## The definition of frequency sets and subsets

To set up the states of Chaosynth, we defined four different sets of frequency values (in Hz): Mercury, Venus, Mars and Jupiter. To define these sets we used a method inspired by 16th Century astronomy (it is not our aim, however, to explain this method in this report). The sets are as follows:

Mercury = { 56.37, 75.19, 110.39, 147.23, 216.16, 317.35, 423.27, 621.42, 828.82, 1216.82, 1786.48, 2382.72, 3177.98, 5135.85, 7540.17 }

Venus = { 56.37, 82.76, 91.1, 110.39, 147.39, 178.39, 216.16, 288.3, 349.32, 465.91, 564.53, 684.03, 912.33, 1105.44, 1474.39, 1786.48, 2164.62, 2887.08, 3498.08, 4665.73, 5653.33, 7540.17 }

Mars = { 82.76, 261.91, 2382.72, 7540.17 }

Jupiter = { 51.21, 82.76, 147.23, 261.91, 465.91, 752.95, 1339.43, 2382.72, 3850.66, 6849.97 }

We then defined 7 subsets of frequency values from each set. We explain the criteria for the definition of the subsets by illustrating the definition of the subsets derived from the Jupiter set (Figure 9). Figure 9: The definition of subsets

a) Subset type 1: the whole Jupiter set;
Jup(1) = { 51.21, 82.76, 147.23, 261.91, 465.91, 752.95, 1339.43, 2382.72, 3850.66, 6849.97 }

b) Subset type 2: large range of low-values of the set;
Jup(2) = { 51.21, 82.76, 147.23, 262.91, 465.91 }

c) Subset type 3: large range of high-values of the set;
Jup(3) = { 752.95, 1339.43, 2382.72, 3850.66, 6849.97 }

d) Subset type 4: narrow range of very low-values of the set;
Jup(4) = { 51.21, 82.76, 147.23 }

e) Subset type 5: narrow range of medium low-values of the set;
Jup(5) = { 2621.91, 465.91 }

f) Subset type 6: narrow range of medium-high values of the set;
Jup(6) = { 752.95, 1339.43 }

g) Subset type 7: narrow range of very high-values of the set;
Jup(7) = { 2382.72, 3850.66, 6849.97 }

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