You should probably use playrange.
this would jump to 200 and play until 300
if checktext.text = "STOP" then
dir.playrange(200, 300)
end if
or you can replaced the fixed number with duration of the scene director so...
if checktext.text = "STOP" then
dir.playrange(200, dir.duration)
end if
of course you'll need to go get the scene and scenedirector from the engine before that will work. You ok with that bit?
#XPression