swftools does not recognize the latest 1pixelout wordpress plugin.
This link:
http://www.1pixelout.net/code/audio-player-wordpress-plugin/
goes here:
http://wpaudioplayer.com/
and further suggests getting the latest plugin here:
http://wordpress.org/extend/plugins/audio-player/
the standalone version is also available here:
http://wpaudioplayer.com/wp-content/downloads/audio-player-standalone.zip

I downloaded the standalone and renamed directory 'audio-player' to '1pixelout' and now it shows as installed.