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Well what the book will mainly cover is that all an audio signal is... is a collection of samples "or values" and DSP is how we can mathematically alter those values to give us different results. Most effects are fairly simple in how they work, for instance... a clipper. All it does is look at the incomming value and ask itself if the value is under or over the cliping limit. If the value is over, then it returns the clipping limit, and if it is under, then it returns the signal.
The book will be a good help for people understanding how these things work.
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