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1993-12-08
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DOCUMENT:Q104771 07-DEC-1993 [W_NT]
TITLE :MIDI Problems with ProAudio Spectrum 16
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
-----------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
-----------------------------------------------------------------------
SYMPTOMS
========
After you load the ProAudio Spectrum 16 driver and restart Windows NT,
you may receive a Service Control Manager error message referring you
to the Event Viewer. The Event Viewer message states that a MIDI
driver is not installed or configured correctly or "Can't find OPL
Synthesizer." This error message does not necessarily prevent you from
playing .WAV files.
CAUSE
=====
In order to play MIDI files with the ProAudio Spectrum 16 card, you
must have the Media Vision OPL3 FM Synthesizer Driver loaded. The OPL3
FM Synthesizer Driver should load automatically when the Pro Audio
Spectrum 16 driver is loaded, although in some cases, the OPL3 FM
Synthesizer Driver is not loaded successfully.
RESOLUTION
==========
Following are possible work arounds:
1. Verify that MVI OPL3 is the current selection in MIDI Mapper.
2. Verify that MIDI Synthesizer is not loaded in Control Panel, Drivers.
3. Remove the Pro Audio Spectrum 16 driver, then reinstall the driver.
4. Add the FMClockOverride setting to the Windows NT Registry. Media
Vision has confirmed incompatibilities between unspecified motherboard
chip sets and the chip sets on the Pro Audio Spectrum 16 card.
Differences in oscillator speed, which is responsible for FM
synthesis, can cause inconsistencies in sound quality. Adding the
FMClockOverride parameter may solve this problem.
WARNING: Using Registry Editor incorrectly can cause serious, system-
wide problems that may require you to reinstall Windows NT to correct
them. Microsoft cannot guarantee that any problems resulting from the
use of Registry Editor can be solved. Use this tool at your own risk.
1. Run REGEDT32.EXE.
2. Select the following subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
\MVAudio\Parameters
3. From the Edit menu, choose Add Value.
4. The parameters for the new value should be the following:
Value Name: FMClockOverride (case sensitive)
Data Type: REG_DWORD
Data: 1
Radix: Hex
NOTE: Media Vision only supports the Pro Audio Spectrum 16 adapter in
computers with bus speed set to 8 megahertz. Bus speed is not the same
as CPU speed.
The Pro Audio Spectrum 16 is manufactured by Media Vision, a vendor
independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
To contact Media Vision Technical Support, please call (800) 638-2807.
Additional reference words: 3.10 sound midi
KBCategory:
KBSubCategory: hrdwr
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1993.