xenial (1) freqtweak.1.gz

NAME

       freqtweak - Realtime audio frequency spectral manipulation

SYNOPSIS

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

DESCRIPTION

       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.

MOUSE CONTROL

       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.

OPTIONS

       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.

EXAMPLES

       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 &

SEE ALSO

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

AUTHOR

       Freqtweak was written and is maintained by Jesse Chappell <jesse@essej.net>.

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

                                                February 11, 2003                                   FREQTWEAK(1)