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rjw57

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  1. Zappa's "Shut Up and Play 'Yer Guitar". Needs to be listened to in the foreground I believe.
  2. Thank you everyone. While waiting for the help you have all provided, I began to realize that the isochronous transfer mode was, as iago describes, a method of ensuring bandwidth rather than a method of transfer timing. Many thanks to sjoc2000 though for a potential fix. I greatly appreciate all the input and I hope that a "usb expert" will show up as well so that I can learn more about troubleshooting the usb audio interface. Merry Christmas to all that celebrate!
  3. I am investigating the sometimes poor performance of my usb audio (occasional clicks and pops). My setup is USB output from port 5 of one of my two mobo based usb hubs (Intel 6 series/C200 series usb enhanced host controller) to a Musical Fidelity V-Link II (96 kHz) usb to spdif to one of my Integra DTR-40.2's optical inputs. I downloaded a program called USBlyzer in order to capture the stream and see if there were any anomalies (or at least what I perceive to be anomalies). In doing so, I discovered a couple of things: 1) my transfer mode is isochronous (i thought the MF Vlink supported async?) 2) when "stopping" the music via a "stop" button in my music software (jRiver or Rdio), I see that there is a problem with this as reported by the USBlyzer software. Specifically, I get a "cleanup" request from "audiodg.exe" whose supporting driver is "usbaudio" that results in an "Invalid Device Request". I next get a "cleanup" request from "audiodg.exe" whose supporting driver is "ksthunk" that results again in an "Invalid Device Request". The capture output is attached for those interested (jpg form). My question is this... what am I doing wrong here that I am having driver issues and that I am not transferring in async mode? I apologize ahead of time for my ignorance regarding usb transfer protocols, but I would sure like to understand this better. Thanks in advance. Bob W
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