Generating Spatialized Auditory Icons Using MPlayer And Ladspa

1 Executive Summary

The Emacspeak GitHub repository now includes a new auditory icon theme
pan-chimes — these are the result of spatializing theme chimes.

2 Fun With Ladspa, MPlayer and Library tap-plugins

Here is the result of some fun with MPlayer and Ladspa over the
Thanksgiving weekend. Package tap-plugins provides a number of
interesting Ladspa plugins; one of these, tap_reverb is used in
module emacspeak-m-player to provide a variety of predefined
effects.

Library tap-plugins also includes Ladspa filter tap_autopan that
pans the input audio signal — see that plugin's documentation for
details.

The Linux media player mplayer allows the injection of ladspa
plugins in its processing chain.
Combining these, I have created theme pan-chimes that provides a
spatialized version of sound-theme chimes.

See script apply-pan.sh in the Github repository to see how this new
theme was generated.