Xitel MD-PORT User Manual - page 10

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START -> CONTROL PANEL -> SOUNDS AND AUDIO DEVICES all of the following operations happen

under the tabs that appear in this window

UNDER THE VOLUME TAB:

Next to the speaker icon it should say MD-Port I/O. In the Device Volume section, put the slider to high.

Check also that mute is not selected.

UNDER THE AUDIO TAB:

Under Sound Playback, you should have the default device as MD-Port I/O. Hit the Advanced button in

this section. Under the Performance Tab in the window that opens, set the sample rate conversion quality

slider to best. Under Sound Recording, you should have the default device as MD-Port I/O. Make sure that

the use only default devices option at the bottom of the window also has a check mark next to it.

UNDER THE VOICE TAB: 

Voice playback default device should be set as MD-Port I/O. Voice recording default device should be set

as MD-Port I/O.

UNDER THE HARDWARE TAB:

Scroll down until you get to USB Audio Device and click on this. It should list the Location as 

MD-Port I/O and list the Manufacturer as (generic USB audio). Now click on the Properties button in this

screen to open up a new USB Audio Device Properties window. Under the General tab, make sure that

down the bottom Device Usage is set to use this device (enabled). Now click on the Properties tab and

open up the option Audio Devices. Double click on USB Audio Device and make sure it is set to use audio

features on this device. Now click on the Driver tab. If you are connected to the internet, hit the option

Update Driver. 

If this doesn't get your MD-Port I/O working, you'll need to go back to the last window and select the

troubleshooting option to run the system self-help. 

The second thing that can cause this is where the soundcard installed in your system does not correctly

release audio resources. This will prevent the MD-Port I/O from being available as a choice in the

multimedia control panel. Most soundcard manufacturers are now aware of this problem and have

released updated drivers that fix this issue. Check with the vendor of your soundcard to get the latest

drivers for your hardware. If the soundcard you have came pre-installed in your system, check with the

manufacturer of your system for the latest soundcard drivers. 

3.  Your MD-Port I/O seems to be introducing pops and clicks 

Problem: You’ve installed the MD-Port I/O and it seems to be playing fine, except there are pops and

clicks or distortion.

Fix: Some USB host controllers do not function within USB specification. Also Windows, in conjunction

with other hardware in your system, may be consuming all the isochronous bandwidth of the USB. Both of

these interfere with the data flowing to the MD-Port I/O, causing it to randomly add pops and clicks or

distortion. The main instances where this occurs is if: 

•

USB frame rates are out of specification - isochronous data transfer (required for audio) is not

possible via USB with a frame rate that is too fast or too slow. 

•

Controllers do not enumerate devices correctly - some controllers do not send USB resets at the

appropriate times or may enumerate one part of a composite device.

•

Corrupting audio data - some USB controllers introduce artifacts into sound data (i.e. CATC traces of

USB data have shown non-zero vales in data that should be all zeros).

To solve this problem, make sure you’re not running any other programs in the background when trying to

play using the MD-Port I/O - anything that causes a lot of hard disk access can effect the data flowing

down the USB. Virus checking programs that continually run in the background are particular bad. Some

drastically effect the isochronous data flow down the USB and starve the MD-Port I/O of data. It’s

therefore important to disable all virus checking programs. Also, make sure that you’re running the most

up to date drivers for your graphics cards and modems. 

Note: If you’re using a laptop or notebook computer, the data flowing to the MD-Port I/O can be severely

effected by the processing power management of the CPU. Ensure that in the System control panel your

computer is set to Desktop. To verify this, go to Start, then Settings, then Control Panel. Click on System

and go to the Performance Tab. In Performance, click on File System and make sure your laptop is set to

Desktop and not Server. Laptops are not suitable for the decoding and playing of MP3 via USB in power

conservation mode due to the variable operating speed of their CPU and other power management

features. You should make sure that the advanced power management settings of your laptop are set so

that your CPU operates at a constant and maximum clock speed. Check your laptop user manual, or with

your laptop manufacturer on how to do this. If your laptop is also equipped with a wireless network or lan,

make sure that your local area connection is turned off if you’re not within range of the network. If you’re

using Windows XP, make sure you’ve installed all of the latest Microsoft Windows XP updates including at

least Service Pack 1 and Messenger Update for Audio and Video.

4.  Your MD-Port I/O doesn’t seem to be working in Windows XP

Follow these steps to ensure that your MD-Port I/O is installed correctly in Windows XP. Firstly, make sure

you’ve installed all of the latest Microsoft Windows XP updates including at least Service Pack 1 and

Messenger Update for Audio and Video. Then go to: