I have seen it mentioned that by default the built-in internal
reverb of the DLSMusicSynth is active. I've also seen code in more
than one place that shows how to deactivate it. Why is that when I
omit the line to deactivate the reverb, I not only don't hear
reverb, I hear nothing coming from my DLSSynth? Also, what
parameters does the default reverb have and how I can access them?
// Turn off the reverb on the synth
err = AUGraphGetNodeInfo (graph, synthNode, 0,0,0, synthUnit)
usesReverb = 0
//THIS NEXT LINE IS THE LINE THAT I OMIT, WHICH GIVES ME SILENCE
err = AudioUnitSetProperty(synthUnit,
kMusicDeviceProperty_UsesInternalReverb, kAudioUnitScope_Global, 0,
usesReverb, 4)
When you turn off the internal reverb on the synth, it will change
the way it outputs data:
Internal Reverb off:
It will output data on the first output element only (el == 0)
Internal Reverb on:
It will output data on both output elements, el==0 will have the
reverb signal (the synth's output that should be taken through the
reverb) and el==1 will have the dry signal
You should change this property with the AU not being initialised -
so you should do this after AUGraphOpen and before AUGraphInitialise
I don't exactly know why you aren't hearing sound - but you have to
have both outputs of the synth active - if you were playing a sound
that was only using the reverb, then there would be no output on
el==1...
Bill
// Start playing
err = AUGraphStart(graph)
Thanks,
Erick
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