[Bug 21589] New: MacOS error from MIDI SetVolume

http://bugs.winehq.org/show_bug.cgi?id=21589

Summary: MacOS error from MIDI SetVolume
           Product: Wine
           Version: 1.1.36
          Platform: x86
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: winmm&mci
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=26043)
 --> (http://bugs.winehq.org/attachment.cgi?id=26043)
console output during tests

Hi,

The midi tests now in git that will appear with wine-1.1.38 produce a strange
error on MacOS:
err:wave:AudioUnit_GetVolume
  AudioUnitGetParameter return an error "\xff\xff\xd5\x8e"
Same error for SetVolume

a) Is dbg_fourcc() really the appropriate method for reporting error codes
there? It rather looks like a small negative number:
-10866 aka. kAudioUnitErr_InvalidScope

b) The same function succeeds when called from waveGetVolume in tests/wave.c on
a wave handle instead of a MIDI one.
Perhaps the MacOS MIDI SW-synth does not support volume settings after all?

Perhaps a more elaborate filter graph would be needed to support variable
volumes? One would then question whether MIDICAPS_VOLUME need be reported at
all in such a case and possibly drop support for Get/SetVolume in midi.c -- or
implement said filter graph.
This is just supposition. I'm not familiar with MacOS programming.