I recently took a first chance with a well-known MacBook app; the intent was getting a keyboard instrument to transmit its patch collection to a MacBook Pro. The result was that the keyboard's OS got fully locked up, requiring a visit from a tech to get it restored to normal operations. I had thought that keyboard internals for the OS and the patch files were totally isolated, and that a data stream for patch files could not interfere with the OS. It is an older keyboard and I suspect that possibly the app may need to be configured with delays between the messages so as to prevent overloads. Comment is invited.