CoreAudioMBS.AudioUnitReset(componenthandle as Integer, scope as Integer, element as Integer) as Integer

Errorcode is returned.

Useful constants:

kAudioUnitScope_Global	= 0
kAudioUnitScope_Input	= 1
kAudioUnitScope_Output	= 2
kAudioUnitScope_Group	= 3
kAudioUnitScope_Part	= 4

CoreAudioMBS.AudioUnitSetParameter(AudioUnit as Integer, ParameterID as Integer, AudioUnitScope as Integer, AudioUnitElement as Integer, value as single, BufferOffsetInFrames as Integer)

CoreAudioMBS.AudioUnitSetPropertyMemory(AudioUnit as Integer, propertyID as Integer, AudioUnitScope as Integer, AudioUnitElement as Integer, data as memoryblock, offset as Integer, length as Integer)

Lasterror is set.
Constants for AudioUnitScope:

kAudioUnitScope_Global	= 0
kAudioUnitScope_Input	= 1
kAudioUnitScope_Output	= 2
kAudioUnitScope_Group	= 3
kAudioUnitScope_Part	= 4

CoreAudioMBS.AudioUnitSetPropertyString(AudioUnit as Integer, propertyID as Integer, AudioUnitScope as Integer, AudioUnitElement as Integer, data as string)

Lasterror is set.
Constants for AudioUnitScope:

kAudioUnitScope_Global	= 0
kAudioUnitScope_Input	= 1
kAudioUnitScope_Output	= 2
kAudioUnitScope_Group	= 3
kAudioUnitScope_Part	= 4

CoreAudioMBS.AudioUnitUninitialize(componenthandle as Integer) as Integer

Errorcode is returned.

CoreAudioMBS.CloseComponent(componenthandle as Integer)

Do not use the componenthandle any more after this call!

CoreAudioMBS.OpenDefaultComponent(type as string, subtype as string) as Integer

Dim c As New CoreAudioMBS

Const kAudioUnitComponentType    = "aunt"
Const kAudioUnitSubType_Output    = "out "

// open default output component
Dim n As Integer = c.OpenDefaultComponent(kAudioUnitComponentType, kAudioUnitSubType_Output)

If n = 0 Then
  Break // failed
Else
  Break
  // okay, so close
  c.CloseComponent(n)
End If

You can check the "QT Components list" example project for which components are installed.
Returns 0 on any error.
type and subtype must be 4 letter codes.

useful constans:

kAudioUnitComponentType	= "aunt"
kAudioUnitSubType_Output	= "out "
kAudioUnitID_HALOutput	= "ahal"
kAudioUnitID_DefaultOutput	= "def "
kAudioUnitID_SystemOutput	= "sys "
kAudioUnitID_GenericOutput	= "genr"
kAudioUnitSubType_MusicDevice	= "musd"
kAudioUnitID_DLSSynth	= "dls "
kAudioUnitSubType_SampleRateConverter	= "srcv"
kAudioUnitID_PolyphaseSRC	= "poly"
kAudioUnitSubType_FormatConverter	= "fmtc"
kAudioUnitID_Interleaver	= "inlv"
kAudioUnitID_Deinterleaver	= "dnlv"
kAudioUnitID_AUConverter	= "conv"
kAudioUnitSubType_Effect	= "efct"
kAudioUnitID_MatrixReverb	= "mrev"
kAudioUnitID_Delay	= "dely"
kAudioUnitID_LowPassFilter	= "lpas"
kAudioUnitID_HighPassFilter	= "hpas"
kAudioUnitID_BandPassFilter	= "bpas"
kAudioUnitID_PeakLimiter	= "lmtr"
kAudioUnitID_DynamicsProcessor	= "dcmp"
kAudioUnitSubType_Mixer	= "mixr"
kAudioUnitID_StereoMixer	= "smxr"
kAudioUnitID_3DMixer	= "3dmx"