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-.TH zretune 1 "Sect 2012" "version 0.0.1" "USER COMMANDS"
-.SH NAME
-zretune \- resample an audio file in order to change its pitch
-.SH SYNOPSIS
-.B zretune
-[options] input-file output-file
-.SH DESCRIPTION
-.B zretune
-resamples an audio file by a the inverse of a ratio expressed in cents,
-without changing the nominal sample rate. The result is to change the
-musical pitch and lenght of the file. Input can be any audio file
-readable by the libsndfile library. The output file type is either
-WAV or CAF.
-.SH OPTIONS
-.TP
-.B --help
-Display a short help text.
-.TP
-.B --cent pitch change in cents
-The number of cents by which the pitch is changed. The accepted
-range is +/- 1200 cents, the useful range in practice will be
-something like +/- 100 cents.
-.SS Output file type
-.TP
-.B --wav
-Produce a WAV file, or for more than 2 channels, a WAVEX file.
-This is the default.
-.TP
-.B --amb
-Produce a WAVEX file with the Ambisonic GUID. Such files should
-have the
-.B .amb
-filename extension.
-.TP
-.B --caf
-Produce a Core Audio file.
-.SS Output sample format
-.TP
-.B --16bit
-Output sample format is signed 16-bit. This option also
-enables the use of dithering, described below.
-.TP
-.B --24bit
-Output sample format is 24-bit. This is the default.
-.TP
-.B --float
-Output sample format is 32-bit floating point.
-.SS Dithering
-.TP
-.B --rec
-Add white dithering noise with a rectangular distribution. This
-is the best option if the output data is going to processed again,
-but in that case it would be advisable to use 24-bit or float.
-.TP
-.B --tri
-Add filtered noise with a triangular distribution. Compared to the
-rectangular dither this reduces the noise density in the lower
-frequency range.
-.TP
-.B --lips
-This uses the optimal error feedback filter described by
-Stanley Lipschitz. This is recommended is the output is the
-final distribution format, e.g. for a CD.
-.SS Timing
-.TP
-.B --pad
-Insert zero valued input samples at the start and end so that the output
-includes the full symmetric filter response even for the first and last
-samples.
-.SH EXIT STATUS
-Zero in case there are no errors, non-zero otherwise.
-.SH AUTHOR
-Fons Adriaensen (fons (at) linuxaudio.org)