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AUListenerAddParameter returns -50

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AUListenerAddParameter returns -50

Subject: AUListenerAddParameter returns -50
From: Stephen Blinkhorn <email@hidden>
Date: Fri, 19 Jan 2007 21:15:47 +0000

Hello all, I am having problems with a AUListenerAddParameter call that is returning an OSStatus of -50 which I believe is a parameter error.

synthTypeParam.mAudioUnit = inComponentInstance; synthTypeParam.mScope = kAudioUnitScope_Global; synthTypeParam.mElement = 0; synthTypeParam.mParameterID = kGlobalSynthType1; OSStatus status = AUListenerAddParameter(parameterListener, this, &synthTypeParam);

I am not sure about my use of inComponentInstance which I get from my audio unit's constructor for example:

MySynth::MySynth(ComponentInstance inComponentInstance) : AUMonotimbralInstrumentBase(inComponentInstance, 0, 1).

Everything else looks ok to me.  Can anyone see what I'm missing?

thanks,
Stephen.
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