I think you could use the 'scale' object from the Motex library you will need to make sure the Motex library is loaded before gem in your .pdrc or .bat file as there is also an object in gem called > scale.
scale 0 127 -360 360 ++++++++++++++++++++++++++++++++++++++++++++++++++++ robcanning www.robcanning.utvinternet.com www.cmc.ie/composers www.soundin.org