exception with preexisting transmitters and empty timeline when calling insert-time-span first:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.get(ArrayList.java:323)
at de.sciss.meloncillo.io.DecimatedWaveTrail.readFrames(DecimatedWaveTrail.java:575)
at de.sciss.meloncillo.io.DecimatedWaveTrail.drawWaveform(DecimatedWaveTrail.java:360)
at de.sciss.meloncillo.gui.WaveformView.paintAmpLin(WaveformView.java:363)
at de.sciss.meloncillo.gui.WaveformView.paintComponent(WaveformView.java:325)
at javax.swing.JComponent.paint(JComponent.java:1006)
at de.sciss.gui.ComponentHost.redrawImage(ComponentHost.java:194)
at de.sciss.gui.ComponentHost.paintComponent(ComponentHost.java:267)
at de.sciss.gui.ComponentHost.paint(ComponentHost.java:250)
at javax.swing.JComponent._paintImmediately(JComponent.java:4890)
at javax.swing.JComponent.paintImmediately(JComponent.java:4676)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:477)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:114)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
