## 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* [24].

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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