from java.lang import System
System.setProperty( "java.awt.headless", "true" )
ds= getDataSet( 'http://www.autoplot.org/data/fireworks.wav' )
plot( 0, ds )
plot( 1, fftWindow( ds, 512 ) )
setCanvasSize( 800, 600 )
writeToPng( 'test001.png' )