Provided by: rubberband-cli_1.8.1-7ubuntu2_amd64 bug


       rubberband — an audio time-stretching and pitch-shifting utility program


       rubberband [options]  [input file]  [output file]


       This manual page documents briefly the rubberband command.

       Rubber  Band  is  a  program  that  permits  you to change the tempo and pitch of an audio
       recording independently of one another.


       These programs follow the usual GNU command line syntax, with long options  starting  with
       two dashes (`-').  A summary of options is included below.

       You must specify at least one of the following time and pitch ratio options.

       -t, --time X
                 Stretch to X times original duration, or

       -T, --tempo X
                 Change tempo by multiple X (equivalent to --time 1/X)

       -p, --pitch X
                 Raise pitch by X semitones, or

       -f, --frequency X
                 Change frequency by multiple X

       The  following  option  provides  a  simple  way  to adjust the sound.  See below for more

       -n, --crisp N
                 Crispness (N = 0,1,2,3,4,5); default 4 (see below)

       The remaining options fine-tune the processing mode  and  stretch  algorithm.   These  are
       mostly  included  for test purposes; the default settings and standard crispness parameter
       are intended to provide the best sounding set of options for most situations.

       -P, --precise
                 Aim for minimal time distortion (implied by -R)

       -R, --realtime
                 Select realtime mode (implies -P --no-threads)

                 No extra threads regardless of CPU and channel count

       --threads Assume multi-CPU even if only one CPU is identified

                 Disable phase resynchronisation at transients

                 Band-limit phase resync to extreme frequencies

                 Disable phase locking to peak frequencies

                 Disable large-ratio softening of phase locking

                 Use longer processing window (actual size may vary)

                 Use shorter processing window

       --thresh N F
                 Set internal freq threshold N (N = 0,1,2) to F Hz

       -d, --debug N
                 Select debug level (N = 0,1,2,3); default 0, full 3 (N.B. debug level 3 includes
                 audible ticks in output)

       -q, --quiet
                 Suppress progress output

       -h, --help
                 Show a list of available options

       "Crispness" levels:

       0         equivalent to --no-transients --no-peaklock --window-long

       1         equivalent to --no-transients --no-peaklock

       2         equivalent to --no-transients

       3         equivalent to --bl-transients

       4         default processing options

       5         equivalent to --no-peaklock --window-short (may be suitable for drums)


       Rubber Band was written by Chris Cannam <>.

       This  manual  page  was written by Székelyi Szabolcs <> for the Debian system
       (but may be used by others), because the original program does not  have  a  manual  page.
       Permission  is  granted to copy, distribute and/or modify this document under the terms of
       the GNU General Public License, Version 2 any later version published by the Free Software

       On  Debian  systems,  the  complete text of the GNU General Public License can be found in