why can't i hear anything?

you probably can't hear anything because bob's default settings are not compatible with your system. you'll have to read about how to configure bob to use the appropriate devices on your system.

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why is bob throwing midi exceptions?

again. . .this is probably because bob's default settings are not compatible with your system. . .and you'll need to create a custom configuration file. . .i.e. see above.

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why is bob throwing spring/xml exceptions?

you have an issue in your custom spring configuration file. try looking at it closely, or going to springframework.org for more information.

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