10.2.3, 10.2.3 is out with audio improvements Options

[ryosode]

Here's an excerpt from 10.2.3 release document. This may be a good news some peple here...

http://docs.info.apple.com/article.html?artnum=107263

...
Audio Enhancements

* Addresses a potential issue in which sound from some USB audio devices may "stutter" after waking from sleep.
* Addresses an issue in which iSub, when used with some third-party USB speakers, could produce static.
* Improves default reverb setting for applications which use QuickTime Musical Instruments.
* Addresses an issue in which audio recorded from a USB device with a sample rate of 48k or 96k may include distortion.
* Improves results when recording from a USB microphone with a sample rate of 11.025k or 22.050k.
* Addresses an issue in which a MIDI device may unexpectedly fail to be recognized, when several devices are connected.
* Refines MIDI device support by removing compatibility for MIDI devices that are connected via a serial port (which Apple has not shipped with machines for several years).

[BusError]

a MIDI plugin is just a layer on top of something else. It can be on top of a serial driver, USB, firewire, PCI etc. But it has un underlying "provider"