Provided by: freqtweak_0.7.2-4build1_amd64 bug


       freqtweak - Realtime audio frequency spectral manipulation


       freqtweak [-h] [ -c <num> ] [ -i <str> ] [ -o <str> ] [ -n <str> ] [ -D <str> ] [ -p <str>
       ] [ -r <str> ]


       freqtweak is a graphical tool for realtime audio spectral  manipulation  and  display.  It
       provides several algorithms for processing audio data in the frequency domain and a highly
       interactive GUI to manipulate each associated filter.  It  also  provides  high-resolution
       spectral  displays  in  the  form of scrolling-raster spectrograms and energy vs frequency
       plots displaying both pre and post-processed spectra.

       Freqtweak is a jack client. You need to have jackd running in order to get sound input and
       output with freqtweak.


       The  processing filters are controlled through mouse operations on each filter GUI window.
       The possible operations are:

       Left button click/drag to draw filters. If Control is down, the y-axis  is  fixed  at  the
       last cursor location (to draw nice horizontal lines).  If Control and Alt are down you can
       draw nice arbitrary straight lines.

       Right button drag to move filters around in space.  The filters wrap around the left/right
       edges unless you hold down Control.  Dragging with both left and right buttons down on the
       GUI for the Gate processor moves both the primary and the alternate filter together.

       Holding Shift modifies the alternate filter (on double filter graphs like  Gate)  for  the
       previous operations.

       Middle-button pops up frequency axis menu.

       Ctrl-Alt right-click resets a filter to default values.

       Shift-Ctrl-Alt left-drag zooms in on the y axis.  Look at the status bar to see the values
       for the cursor itself and the values of the filter at the cursor's frequency.

       Shift-Ctrl-Alt right-click release resets the Y-zoom to full.

       The B and BA buttons mean Bypass and Bypass All respectively.

       The L and LA buttons mean Link and Link All respectively.

       The G and GS buttons mean Toggle Grid and Toggle Grid Snap respectively.


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

       -h, --help
              Show summary of options.

       -c <num>, --channels=<num>
              Processing channels (1-4). Default is 2.

       -i <str>, --inputs=<str>
              Connect inputs from these jack ports (separate each channel with commas).  Defaults
              to 'alsa_pcm:capture_1,...'

       -o <str>, --outputs=<str>
              Connect outputs to these jack ports (separate each channel with commas).   Defaults
              to 'alsa_pcm:playback_1,...'

       -n <str>, --jack-name=<str>
              Jack name. Default is freqtweak_1.

       -D <str>, --tmpdir=<str>
              Jack server tmp directory (should match jackd --tmpdir).

       -p <str>, --preset=<str>
              Load the given preset initially.

       -r <str>, --rc-dir=<str>
              Specifies what directory to use for run-control state. Default is ~/.freqtweak.


       Here  is  an  example of using freqtweak with an alsaplayer feeding it and output going to
       speakers (alsa_pcm:out_?) without using a JACK patchbay:

       Start freqtweak first with this command line:

       freqtweak -n ft &

       Then start alsaplayer like so:

       alsaplayer -o jack -d ft:in_1,ft:in_2 &


       jackd(1), jack_connect(1), jack_lsp(1)


       Freqtweak was written and is maintained by Jesse Chappell <>.

       This manual page was created by Enrique Robledo Arnuncio <> for  the  Debian
       GNU/Linux system, using text from the README file by Jesse Chappell.

                                        February 11, 2003                            FREQTWEAK(1)