http://www.estecho.com/gear/Acetone_PS1000.php
http://m.matrixsynth.com/2006/04/ace-tone-ps1000.html
http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fsynthetic-neurosis.air-nifty.com%2Fblog%2F2010%2F02%2Facetone-ps-1000.html
http://old.nabble.com/Ace-Tone-PS-1000-tc4116696.html