actor: Port Synaesthesia

[dsmit]

http://www.logarithmic.net/pfh/synaesthesia

oldskool from XMMS ;-).

[hartwork]

FYI I found a post-2.4 port at https://github.com/dreamlayers/synaesthesia and that 2.4 is packaged in a number of distros (https://repology.org/project/synaesthesia/versions).