ghostess(1) General Commands Manual ghostess(1)
NAME
ghostess - graphical DSSI plugin host
SYNOPSIS
ghostess [-debug level] [-hostname hostname] [-projdir projdir] [-uuid uuid] [-noauto] [-f cfgfile] [-n] [-chan c] [-conf k v] [-prog b p]
[-port p f] soname[:label] [...]
DESCRIPTION
ghostess is a DSSI host that listens for MIDI events, delivers them to DSSI synth plugins, and outputs the resulting audio via JACK.
ghostess also supports DSSI plugins having audio inputs (effects), LADSPA plugins, and the use of DSSI-style user interfaces with LADSPA
plugins. ghostess can host up to 32 plugin instances at one time.
Depending on the compile-time configuration, ghostess will receive MIDI events from ALSA, JACK MIDI, or CoreMIDI. Unless otherwise speci-
fied by the -chan option, each plugin instance is sequentially assigned a MIDI channel, wrapping from 15 (zero-based) back to 0 when neces-
sary. Unless -noauto is specified, plugin inputs and outputs are connected sequentially to the available JACK physical input and output
ports, respectively, wrapping back to the first port whenever the available ports are exhausted.
At startup, ghostess presents a simple GTK+ user interface. Each plugin instance is represented in a frame, labeled with the plugin name,
and containing a MIDI activity indicator and a 'UI' button. Left-clicking the 'UI' button will start or hide the plugin's user interface
(UI). Right-clicking the 'UI' button will allowing starting, hiding, showing, or terminating the plugin's UI.
The 'Save Configuration...' option of ghostess's 'File' menu allows saving the current configuration of all plugins to a file. Basically,
the file is just a Bourne shell script that can be used to recreate the configuration.
ghostess comes with a minimal universal DSSI GUI, ghostess_universal_gui, that can be used with any DSSI or LADSPA plugin. It does not
read RDF files or instantiate the plugin, so it's not as full-featured as a universal GUI could be, but it does allow for adjusting
DSSI/LADSPA ports, selecting bank and program (for plugins with select_program()), and sending test notes (for plugins with any of the
run_synth() functions). If ghostess cannot find a UI for a plugin, and the universal GUI is in the PATH, ghostess will launch it.
OPTIONS
The following global options are available:
-debug level
Sets bitfield flags which determine which debugging information is printed. The default level of 1 shows errors only, 0 shows noth-
ing, and -1 shows everything. See ghostess.h for details.
-hostname hostname
Sets hostname as the name ghostess uses for itself, for JACK and ALSA clients and GUI window titles. If a JACK port cannot be cre-
ated with that name, the PID is appended.
-projdir projdir
Sets the project directory passed to both plugins and UIs to projdir. The default is none.
-uuid uuid
Sets uuid as the UUID used for JACK session management. There is probably no reason to use this outside of a managed session.
-noauto
Disables automatic connection of plugin outputs to JACK physical outputs.
-f cfgfile
Additional configuration will be read from cfgfile, in the same format as command line options.
For specifying plugin instances, ghostess uses a '[-repetition-count] [options] soname[:label]' format, which may be repeated for multiple
instances. The plugin-specific options are:
-n Specifies the repitition count, or number of instances, of the following plugin to create, where n is an integer between 1 (the
default) and 32.
-chan c
Sets the initial MIDI channel for the following plugin instance to c. Channels are numbered 0 to 15. If the repetition count is
more than one, instances are given sequential channels beginning with c and wrapping from 15 to 0. The default is for all instances'
MIDI channels to be sequentially numbered, starting from 0.
-conf k v
Sets configure item key k and value v for the following instance. May be repeated for multiple keys.
-prog b p
Sets the program change bank b and program p for the following plugin (numbered from 0).
-port p f
Sets the value of port p to floating point number f for the following plugin. May be repeated for different ports.
soname The name of the DSSI or LADSPA plugin library to load, including the '.so' suffix. soname may be an absolute path to the library
file, or just the filename itself, in which case the DSSI search path is searched (see ENVIRONMENT below).
label The label of the DSSI or LADSPA plugin to load from the library soname. If this is omitted, the first plugin in the library is
used.
ENVIRONMENT
ghostess will search for plugin shared libraries in the directories specified by the environment variable DSSI_PATH, which is a colon-sepa-
rated list of directories. If DSSI_PATH is not set, a default search path of /usr/lib/dssi, /usr/local/lib/dssi, and (assuming the environ-
ment variable HOME is set,) $HOME/.dssi is used. Note that while ghostess may be used to host LADSPA plugins, the environment variable
LADSPA_PATH is not used to search for them.
EXAMPLES
Assuming DSSI_PATH is correctly set, the command:
$ ghostess hexter.so
will start a single instance of the plugin hexter, listening on MIDI channel 0, with its output connected to the first JACK physical output
port.
The command:
$ ghostess -noauto -chan 2 xsynth-dssi.so -chan 2 xsynth-dssi.so
will start two instances of Xsynth-DSSI, both listening on MIDI channel 2, but will not automatically connect the plugin outputs to JACK
output ports.
The command:
$ ghostess -debug -1 -hostname fuzzy -projdir /tmp/proj -2 -conf load
mypatches -prog 0 4 -port 7 0.45 effects.so:fuzz
will start two instances of the 'fuzz' plugin within the effects.so library, using /tmp/proj as the project directory, pass configure key
'load' with value 'mypatches' to both instances, set bank 0 and program 4, and set port 7 to 0.45. Assuming it is some sort of effect, the
plugins' inputs and outputs will be automatically connected to the first JACK physical inputs and outputs. Full debugging information will
be printed, and fuzzy will be used as the JACK client name.
AUTHOR
ghostess was written by Sean Bolton, who mercilessly mangled code originally written by Chris Cannam and Steve Harris. This manual page was
adapted by Sean Bolton from the jack-dssi-host manual page originally by Mark Hymers.
September 5th, 2010 ghostess(1)