regression test javax/sound/midi/MidiSystem/DefaultDevices.java fails with mustang b84

reason: MidiSystem.getTransmitter doesn't return RealTimeSequencer's transmitter when RealTimeSequencer is specified in sound.properties as default Transmitter:

property: javax.sound.midi.Transmitter=com.sun.media.sound.RealTimeSequencerProvider#Real Time Sequencer
result: com.sun.media.sound.MidiInDevice$MidiInTransmitter@11121f6
type interface javax.sound.midi.Transmitter failed: class should be 'class com.sun.media.sound.RealTimeSequencer$SequencerTransmitter' but is 'class com.sun.media.sound.MidiInDevice$MidiInTransmitter'!

property: javax.sound.midi.Transmitter=abc#Real Time Sequencer
result: com.sun.media.sound.MidiInDevice$MidiInTransmitter@10655dd
type interface javax.sound.midi.Transmitter failed: class should be 'class com.sun.media.sound.RealTimeSequencer$SequencerTransmitter' but is 'class com.sun.media.sound.MidiInDevice$MidiInTransmitter'!