M-Audio Delta Audiophile 2496 Manual page 32

a card calibration (sometimes called "profiling") the first time you use the software
with a new audio card.
Possible Cause 3: Some accelerated graphics cards use excessive amounts
of system bandwidth, preventing the recording buffer of an audio card from keeping
up with demand. This can cause clicks in the recording. Reducing or turning off the
graphics card's graphics acceleration feature often resolves this problem. In
Windows, the level of graphics acceleration is accessed from Start | Settings
| Control Panel | System | Performance | Graphics.
Problem: The sound from the monitor mixer is muffled. It sounds as if it were
running through a mixer with the treble control turned all the way down!
Possible Cause: The current Audiophile 2496 sample rate is too low. The
monitor mixer is a digital device that runs at the current sample rate of the
Audiophile 2496 board. The frequency response of the mixer is roughly one-half of
the sample rate. There is no way to prevent this lost frequency response while
playing back or recording at a low sample rate. However, it may be prevented when
the system is idle. See the "CODEC SAMPLE RATE" paragraph of the section
'Hardware Settings Page' for more information.
Problem: My software application keeps telling me "sample rate not supported"
or some similar message.
Possible Cause: You have "Rate Locked" set in the Delta Control Panel.
This makes only the sample rate specified in the panel available to Windows and
software applications. Either uncheck "Rate Locked" or set your application to that
locked sample rate.
Problem: Clicking sounds occur at the beginning of and immediately after each
sound.
Possible Cause: Sample rate changes often cause clicks and pops to occur in
the audio. These sample rate changes can happen at the start and end of audio
playback. If "Reset Rate When Idle" is checked under the Hardware page of the
Delta Control Panel software, the Audiophile is changing its sample rate back to a
specified rate each time a sound ends. Then if a sound starts again at a different
sample rate, the Audiophile clock is changed again to meet that new sample rate. To
eliminate this, uncheck the "Reset Rate When Idle" checkbox.
Problem: I am playing AC-3 or surround sound data from a software application
on my computer, sending the data from Audiophile S/PDIF Out to my home theatre's
AC-3 decoder. However, the decoder does not recognize the signal and therefore
refuses to put out any audio.
Possible Cause: There is a bit within the S/PDIF digital audio stream that
defines the S/PDIF content as audio or non-audio. Most AC-3 surround sound
decoders expect this setting to be non-audio and will otherwise reject the
information. Go to the S/PDIF page of the Delta Control Panel, select Consumer and
Advanced Settings, and then select "Non-Audio" as the data type.
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