Re: saving

    | From Sleuth
    | Mon, 10 Sep 2007 14:55:47 -0700
    | Subject: [Audacity-help] saving
    | why can I not find a similar file in Plug-ins, like "pitch.ny" that would
    | allow me to default the pitch to G instead of G#Ab?
    | Answer: Because no such file exists.  But, there is a file,
    | "am_pitchshift_1433.dll," but it is written in stuff I do not understand.
    | What is a "*.dll" file?

A DLL (Dynamic Link Library) is a file containing code that can be loaded and executed dynamically by any program that understands it. Basically it's an
external code repository for programs .

The .dll you refer to is AM Pitchshifter from the Steve Harris plugin suite you
downloaded:
http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#id1433

It is nothing to do with Effect > Change Pitch which is pitchname.cpp in the
source code. Users cannot change this in the pre-compiled builds like the one
I presume you have (e.g. a .dmg or .exe that you downloaded).

As I said in my first reply, Audacity does not do accurate beat or pitch detection.
You need another program if you want that (to the extent that programs can
detect pitch at all from the whole mass of multiple instruments and overtones
that would make up a typical piece of music). To give you a crude example,
create a 440 Hz Sine tone in Audacity, select it and Effect > Change Pitch and
"Pitch from" should detect it accurately as "A". Create a higher tone next to it
(e.g. D above, 588 Hz), select both tones and Effect > Change Pitch, and what
is the effect supposed to do then in terms of detection? Audacity will give you
the first pitch detected which is A, but if the ear hears that sequence it will
detect the "key" as "D" (because of the perceived move from dominant to tonic).

So unless you actually know the key of the piece (and you are sure it is correct
on the file or the recording) Audacity relies on the user to choose a piece of the
music that is ideally a solo instrument playing the tonic note only, then choose
the pitch you want to change to. If Audacity gets it wrong and the pitch is D
instead of C, then instead of going from say C to E as set in the program, you
will actually go from D to F#. The only thing you can say is that whatever the
key of the audio actually is, you will raise the pitch of the whole by 4 semitones.  
At the moment, all Audacity can offer is to remember the semitones change
and direction you last entered within the session. When you first run the
effect in a new session, the semitones change will be 0.0, so the "Pitch to:"
will be the same as the detected "Pitch from".        


Gale Andrews
 



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