documentation - edits to Sound Patterns

[HighHarmonics2]

Includes:

• full revision of 6.4 Sound Patterns section
• tightened up the description - removing narrative elements and focus on code with short explanations
• added some focus on the Player concept
• added a period with a number value in the first example
• edits to strings vs number paragraph
• other text changes to improve clarity

@Bubobubobubobubo - please review in detail.

[Bubobubobubobubo]

Yes, it looks like an useful revision. Aside from the grammar improvements that are noticeable, I find the tone more in line with what is expected of a tutorial. This is something that could be extended, I think, to all the introductory sections at least, even if it means keeping the more informal style for the more advanced parts that require less concentration.

[Bubobubobubobubo]

I'll make sure to regenerate the documentation today in order to bring it online. Thanks for your input!