Using your lead for the Tokay gecko, I found a clip on youtube which is spot on the sound here:
http://www.youtube.com/watch?v=lF0gmHAG3cw

LOL! So it is a Tokay... I read that some people use Tobacco to make them drowsy and get rid of them. Some of the online sources said that if a Tokay bites you the only way to get it off is to submerge it in water and it'll have to let go to breathe! O_O