Hi Brad, A while ago I have wondered the same because it would be nice to control the volume envelope with MIDI CCs. I took the same approach like you did, and managed to write a small test program that maps CC#72 to the VolEnvRelease parameter.
I used Logic Pro X and created a track with the AUSampler instrument (AU Instruments -> Apple -> AUSampler). In the sampler I created a connection and saved the preset, I guess this is what you did in AULab. It still seems to work with iOS 13. Though it seems kind of a hack to read, modify, and write back to the AU fullState. If you are interested I can send you the project. It’s a 4.9 MB zip file. Best, Sven > Am 18.05.2020 um 10:31 schrieb Brad Howes via Coreaudio-api > <coreaudio-api@lists.apple.com>: > > Hi, > > I’m wondering if there is any documentation for the values one finds in an > ‘aupreset’ file? In particular the constants for ‘control’, ‘destination’, > 'scale’, ‘source’, and ‘transform’ values in a ‘Connections’ array. I suspect > these are all just internal values to the audio units being used. I am using > the modern AVAudioSampler in an iOS app and I would like to offer controls > for the shape of the envelope that is used by the instrument when it > generates output. I know from experiments with AU Lab what destination values > to use (I think): > > attack time - 570425244 > hold time - 571473920 > decay time - 572522496 > release time - 573571072 > sustain level - 574619649 > > In AULab there are also some ‘* Factor’ destinations for the above times, but > I am not clear how these affect the final envelope. > > As mentioned, my ultimate goal is to allow the user to adjust the filter > shape with performance parameter changes, just like in AU Lab, by performing > the following steps: > > Load a soundtont file > Fetch the preset definition from AVAudioSampler via > kAudioUnitProperty_ClassInfo property > Modify preset with the proper parameter definitions and connections as > gleaned from AU Lab presets > Update the AUAudioSampler with the changed preset definition > > Does this seem reasonable? Thanks in advance for any doc / reference links > you can provide. > > Regards, > > Brad > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/biochill%40me.com > > This email sent to bioch...@me.com
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