Getting two midi threads to start at exactly the same time

Hello, is it possible to get two threads to start at exactly the same time because when I start two threads or more at the same time that playback midi using a synthesizer, they never start at exactly the same time.
Any help would be appreciated.

Use the Behavior framework for making changes in the scene. This uses an internal j3d thread which is in sync with the rendering thread.
See chapter 4 (Interaction) and 5 (Animation) in the 2nd module of the j3d tutorial (this may not be the correct chapters, since i have a rather old version of the tutorial)

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