Source code of Windows XP (NT5)
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The definitive reference for MIDI Mapper's registry entries.
Aliases are kept in HKEY_LOCAL_MACHINE because they describe the hardware
setup (instrument-port-driver mapping) and are therefore global to the
machine.
Schemes are also global because we want at least the default schemes (which
map all 16 channels to one instrument on a port) to be available to all users.
The current scheme is stored in HKEY_CURRENT_USER.
-------------------------------------------------------------------------------
HKEY_LOCAL_MACHINE
System
CurrentControlSet
Control
MediaProperties
PrivateProperties
Midi
Schemes
%scheme%
[%nn%=%key%
Channels=%chanmask%*]
HKEY_LOCAL_MACHINE
System
CurrentControlSet
Control
MediaResources
Midi
%driver<nnnn>%
Instruments
[%nn%
FriendlyName=%alias%*
Port=%port%*
Definition=%idf%*]
HKEY_CURRENT_USER
Software
Microsoft
Multimedia
MidiMap
CurrentScheme=%scheme%*
[] Section repeats 0 or more times as needed
* Tag represents a value rather than a key
Tag Type Description
=== ==== ===========
%scheme% String Scheme name; subkey into Schemes key.
%nn% String Iterator; no instrinsic meaning.
%key% String Relative midi driver key. either
%driver<nnnn>% or %driver<nnnn>%\Instruments\%nn%
%chanmask% DWORD Binary channel mask (one byte per channel;
LSB is channel 0).
%driver<nnnn>% String Driver key; returned from DRV_QUERYDRVENTRY.
%alias% String Alias for instrument/port combination.
%port% BYTE Port on this driver; range 0..MODM_GETNUMDEVS
for this driver.
%idf% String Filename & instrument of an IDF file; The
filename is first, optionally followed by
a Instrument name in angle '<>' brackets.
for instance 'general.idf<GeneralMIDIInstrument>'