On 7 Jul 2005 at 0:22, Christopher Smith wrote: > On Jul 6, 2005, at 11:39 PM, David W. Fenton wrote:
[] > > Is your MIDI interface USB? If so, you may have something else > > contending for the bandwidth of the USB interface, and that could be > > the reason you're having the problem. > > I have a USB MIDI interface (4 ports) plugged into one of two > available USB ports, also a Logitech wireless mouse, and of course my > computer keyboard, both plugged into my screen's USB port, as > designed. I occasionally plug a SanDisk memory card reader, or a Cue > Cat barcode reader (don't ask!) into the other port, but the problem > is there even when neither one is plugged in. Do you have a non-USB keyboard port? If so, I'd try getting the keyboard off the USB bus so that MIDI is on USB and the rhythmic values you're typing is *not* on USB. That actually could be the source of the problem. I'm not sure how USB prioritizes the order of data sent over the bus. In your case, the order is crucial, and if USB can't maintain that timing-wise, it may be entirely the source of your problem. I have always felt that USB is not a very good technology. I prefer to have only one of my input devices on USB at a time (keyboard or mouse -- the computer I'm typing this on has a USB mouse and a non- USB keyboard), and I don't think it's at all an appropriate technology for any kind of regular data access. That is, I'd never put any storage devices on it that were for any purpose other than backup or portability (i.e., I would never edit data resident on a USB-attached drive). That's not to say I don't use it. My scanner is plugged into USB as are my digital camera interface and my Handspring Visor interface. But all of those are things I use only occasionally, and mostly while not doing something else. That's my rule of thumb -- USB is fine for non-continuous use (mostely) one device at a time. But I don't know anything about the ports provided on a Mac, nor about OS X's implementation of USB support. I don't even know that USB is *not* designed to support real-time data transfer in order from various devices attached to the bus. But it would certainly be the first place I'd start looking to solve the annoying problems you're experiencing. -- David W. Fenton http://www.bway.net/~dfenton David Fenton Associates http://www.bway.net/~dfassoc _______________________________________________ Finale mailing list [email protected] http://lists.shsu.edu/mailman/listinfo/finale
