[Cin] Mixer Align: for audio tracks only (and more issues)

[Andrea paz]

I tried to insert IgorBeg's example in the manual. See if there are
any corrections (also the position in "Appendix E"; maybe it's better
in the "Advance Editing" chapter)?

PS: @Stefan thanks for your contribution: we need any help from people
who can get their hands on the code....
PS: @Phyllis I have separated "Appendix E" from "appendix D" (Real
World ...) which previously contained it. Is it OK for you?
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