Apple

On 31/10/2007, at 18:37, Kevin Dixon wrote:

What is the meaning of the AudioUnitParameterInfo flag
kAudioUnitParameterFlag_IsHighResolution?
It is not documented in the CoreAudio nor in the AudioUnits docs. The
code (AudioUnitProparties.h) also does not have any comments about

I don't remember where I found it, but this flag means that the parameter
cannot be adequately described in 8bits (eg 0-127) of resolution. Mostly
applies to hardware HUIs for stuff like MIDI control.

-Kevin

Thanks, Kevin, but I need a more formal definition for the meaning of this flag.

I'm developing AU plugins that need to work on all AU hosts. The parameters of these plugins are in the 0-1000 range with Float32 resolution. With Logic I found that if I declare the paraemter's unit kAudioUnitParameterUnit_Generic I get integer only resolution from the Logic automation. i.e. if I record the value of 100.25, the automation playback send me back 100.00. If I add the flag kAudioUnitParameterFlag_IsHighResolution I get back correct values. I'm not still no sure what happens on other hosts.

So actually me questions are:

1) How to define a generic parameter with Float32 resolution that will work with automation on all hosts?

2) Is it possible to have a complete documentation on the meaning to all the parameter flags?

Shai Shasag

Senior Software Engineer

Waves Audio Ltd.

Phone: +972-36084007;

Fax: +972-36084056;

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