USB timeout Problems with a large USB/Midi setup
I have a large USB midi controller setup - using Logic Pro 8 and a Macbook 2.16GHz Intel Core 2 Duo 2 GB ram and running 10.5.8. It's used in a live performance situation with Logic acting as a Midi sound source for all the controllers. I've used the environment page to setup each controller's access to the sounds/samplers needed. It runs fine 93% of the time but i have encountered a few problems with USB connections. I know it's a sin to use USB hubs, and they are probably the cause of the problem. I have 6 controllers running : M-Audio Oxygen 8 v2-2 each , O2, Axiom 61, Trigger finger, and Alesis Control Pad. 1 hub with 3 controllers in one USB port of the Macbook, another hub with 3 controller in the other USB port of the Macbook.
Occasionally the USB devices can't talk to Logic, but a disconnect- replug gets them going again, and, less frequently, the USB inputs on the Macbook quit working completely- disconnect and replug has no effect. Restart is the only solution here. Audio-Midi Setup doesn't even see the controllers turning off and on.
2 Questions:
1. What specifically happens to the USB inputs when talking to USB hubs that would cause such a problem? Does the Macbook USB port poll the hub to see if it's alive? or...?
2. When operating 2 M-Audio Oxygen8v2's, their identities switch randomly. They are configured in Audio Midi interface with distinct names, and always plugged into the same USB ports. Every third day or so, the system comes up and mixes the identities. How does each individual controller-especially 2 of the same model- identify itself in it's transmission to the USB ports of the Macbook?
Anyone who can help me with the nuts and bolts of how the Macbook handles these USB transmissions would be much appreciated.
thanks.
Occasionally the USB devices can't talk to Logic, but a disconnect- replug gets them going again, and, less frequently, the USB inputs on the Macbook quit working completely- disconnect and replug has no effect. Restart is the only solution here. Audio-Midi Setup doesn't even see the controllers turning off and on.
2 Questions:
1. What specifically happens to the USB inputs when talking to USB hubs that would cause such a problem? Does the Macbook USB port poll the hub to see if it's alive? or...?
2. When operating 2 M-Audio Oxygen8v2's, their identities switch randomly. They are configured in Audio Midi interface with distinct names, and always plugged into the same USB ports. Every third day or so, the system comes up and mixes the identities. How does each individual controller-especially 2 of the same model- identify itself in it's transmission to the USB ports of the Macbook?
Anyone who can help me with the nuts and bolts of how the Macbook handles these USB transmissions would be much appreciated.
thanks.
Imac, Mac OS X (10.5.8)
