Hi George!

kAudioUnitSubType_DLSSynth is very old and has never been supported in iOS.  
You will want to use kAudioUnitSubType_MIDISynth which is supported on both iOS 
and OS X.  The underlying synth engine for this type is very close to fully 
SoundFont-compatible.  Unfortunately we do not have any documents which 
describe any missing features, if any.  Everything you list below is supported. 
 Please file radars if you find problems.

-DS


> On Nov 18, 2018, at 7:50 AM, George Litterst <[email protected]> wrote:
> 
> I have both Mac and iOS applications that load a custom SoundFont into 
> kAudioUnitSubType_DLSSynth. These apps receive MIDI data and pass on the data 
> to the DLSSynth. This basic scenario works great in our applications.
> 
> We are about to embark on enhancements to our SoundFont based on the 
> parameters defined for SoundFonts in the 2.01 specification (the final 
> SoundFont spec from Creative Labs).
> 
> Can anyone provide a comprehensive list of SoundFont features that are or are 
> not supported by kAudioUnitSubType_DLSSynth in the Mac and iOS environments?
> 
> In particular we plan to improve the realism of various instruments by 
> defining the parameters for the SoundFont's “modulators.” These modulators 
> enable different types of MIDI input (key velocity, key number, continuous 
> controllers, etc.) to control any number of synth parameters. By tweaking 
> these modulator parameters for each instrument in the SoundFont, we can 
> specify—in theory—the way in which a low-pass filter adjusts the timbre of an 
> instrument based on velocity, map the mod wheel to control filter cutoff, 
> crossfade samples, and so forth.
> 
> Of course it would be a delight to learn that kAudioUnitSubType_DLSSynth 
> supports the complete spec.
> 
> Thanks,
> George Litterst
> TimeWarp Technologies


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