Editing Additive synthesis (section)

===Broader definitions===
''Additive synthesis'' more broadly may mean sound synthesis techniques that sum simple elements to create more complex timbres, even when the elements are not sine waves.<ref>
{{cite book     
 | last         = Roads | first = Curtis
 | author-link   = Curtis Roads
 | year         = 1995
 | title        = The Computer Music Tutorial
 | url=https://archive.org/details/computermusictut00road
 | url-access=limited
 | publisher    = [[MIT Press]]
 | isbn         = 978-0-262-68082-0
 | page         = [https://archive.org/details/computermusictut00road/page/n152 134]
}}</ref><ref name="MooreFoundationsCM">
{{cite book     
 | last         = Moore | first = F. Richard
 | year         = 1995
 | title        = Foundations of Computer Music
 | publisher    = [[Prentice Hall]]
 | isbn         = 978-0-262-68082-0
 | page         = 16
}}
</ref> For example, F. Richard Moore listed additive synthesis as one of the "four basic categories" of sound synthesis alongside [[subtractive synthesis]], nonlinear synthesis, and [[physical modelling synthesis|physical modeling]].<ref name="MooreFoundationsCM"/> In this broad sense, [[pipe organ]]s, which also have pipes producing non-sinusoidal waveforms, can be considered as a variant form of additive synthesizers. Summation of [[Principal component analysis|principal components]] and [[Walsh functions]] have also been classified as additive synthesis.<ref>
{{cite book     
 | last         = Roads | first = Curtis
 | author-link   = Curtis Roads
 | year         = 1995
 | title        = The Computer Music Tutorial
 | url=https://archive.org/details/computermusictut00road
 | url-access=limited
 | publisher    = [[MIT Press]]
 | isbn         = 978-0-262-68082-0
 | pages        = [https://archive.org/details/computermusictut00road/page/n168 150]&ndash;153
}}</ref>