Raw score and instrument files 3

This tutorial expands our instrument by adding connections between strings

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String connections

We can add a connection between a point on any string to a point on any other string (or even to the same string). We need to define several parameters to do this:

• mass (kg), >0. Do not set to 0! (0.001 in the example below)
• angular frequency (rad), >0. try to keep below about 1e4 (10000 in the example below)
• loss parameter (bigger means more loss). >=0 (2 in the example below)
• collision exponent (>1, usually <3). Probably best not to use 1 exactly (1.6 in the example below)
• rattling distance (m), >=0. Can be zero! (0.001 in the example below)
• string index 1
• connection point 1 (0-1) (0.8 in the example below)
• string index 2: if zero, then no connection
• connection point 2 (0-1) (0.7 in the example below)

These elements are included in your instrument files as shown below. The parameters

ssconnect_def = [0.001, 10000, 2, 1.6, 0.001, 1, 0.8, 2, 0.7];

Try adding this line to a two string instrument (e.g. the instrument from the last tutorial). Then try running the file with different kinds of scores. Note that you will now get sound on outputs on either string, even if you only excite one of them.

Experiment with different settings for the different parameters.

Note that you can also connect strings to themselves (specify the same string number for both string indexes) and you can also add a connection attached at only one end - specify a zero for the other string index.

Multiple connections

As with the string_def, the ssconnect_def can have multiple connections defined. The syntax is similar: separate each set of parameters with a semicolon. The following example has three connections for example:

% connect string 1 to string 2
% connect string 2 to string 2
% add a loose connection to string 1
ssconnect_def = [0.0001, 10000, 2, 1.6, 0.0001, 1, 0.8, 2, 0.7;   0.0001, 10000, 2, 1.6, 0.0001, 2, 0.1, 2, 0.95;   0.0001, 10000, 2, 1.6, 0.0001, 1, 0.8, 0, 0.7];

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