Not having your user account in the operator group would have stopped it from working. Try echo "test" > /dev/ugen0 and cat /dev/ugen0. Those commands should either do nothing or produce an error, but that error should not be "permission denied".
Of course, maybe you have got it working, and you do not need any more help. You didn't say!
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The only dumb question is a question not asked.
The only dumb answer is an answer not given.
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