[openbeos-midi] About IsPersistent

I search in the BeBook the IsPersistent function and that point me to the same 
function from the class BVolume I what I understood this function return if the 
media 
can be disconnected and then I think the BMidiEndpoint::IsPersistent return the 
same kind of info. That return true if the BMidiEndpoint are hardware published 
from 
a drivers.

I haven't BeOS under my hands then I can't test.
If you have an other answer for that function let us know.
A+
Jerome

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