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Re: Coreaudio-api Digest, Vol 15, Issue 101
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Re: Coreaudio-api Digest, Vol 15, Issue 101


  • Subject: Re: Coreaudio-api Digest, Vol 15, Issue 101
  • From: George Litterst <email@hidden>
  • Date: Sun, 25 Nov 2018 11:44:22 -0500

Thank you so much, Douglas!

George

> On Nov 25, 2018, at 11:26 AM, email@hidden wrote:
>
> We created the kAudioUnitSubType_MIDISynth, which is a full 16-channel
> GM2-compatible AU, to avoid the need to create 16 instances of the Sampler
> AU.  The MIDISynth AU and the Sampler AU share the same synth engine, so you
> lose nothing by using the MIDISynth.  In addition, you gain support for
> program change events which the mono-timbral Sampler cannot do.
>
> When using AUMIDISynth on iOS, you will need a little extra code to pre-load
> all the instruments needed to play each MIDI file.  The information in this
> link explains the how and why:
>
> https://lists.apple.com/archives/coreaudio-api/2016/Jan/msg00015.html
> <https://lists.apple.com/archives/coreaudio-api/2016/Jan/msg00015.html>
>
> -DS
>
>
>
>> On Nov 24, 2018, at 5:57 PM, George Litterst <email@hidden
>> <mailto:email@hidden>> wrote:
>>
>> Thank you very much for the reply, Douglas.
>>
>> I checked with the programmer and now realize that I made an error in what I
>> wrote. To create a 16-channel GM synth, we currently use
>> kAudioUnitSubType_Sampler, which is a mono-timbral. We create 16 instances
>> of kAudioUnitSubType_Sampler in parallel to form the GM synth.
>>
>> Does this sound like the best approach?
>>
>> Does kAudioUnitSubType_Sampler support all of the features of the SoundFont
>> spec?
>>
>> Thanks, in advance.
>>
>> George
>>
>>> On Nov 24, 2018, at 3:00 PM, email@hidden
>>> <mailto:email@hidden> wrote:
>>>
>>> Send Coreaudio-api mailing list submissions to
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>>> Today's Topics:
>>>
>>>  1. Re: kAudioUnitSubType_DLSSynth and support for SoundFont
>>>     2.0.1 features (email@hidden)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Sat, 24 Nov 2018 08:18:44 -0800
>>> From: "email@hidden" <email@hidden>
>>> To: George Litterst <email@hidden>
>>> Cc: email@hidden
>>> Subject: Re: kAudioUnitSubType_DLSSynth and support for SoundFont
>>>     2.0.1 features
>>> Message-ID: <email@hidden>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> 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@hidden> 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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>>> ------------------------------
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>>> End of Coreaudio-api Digest, Vol 15, Issue 101
>>> **********************************************
>>
>

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References: 
 >Re: Coreaudio-api Digest, Vol 15, Issue 101 (From: George Litterst <email@hidden>)
 >Re: Coreaudio-api Digest, Vol 15, Issue 101 (From: "email@hidden" <email@hidden>)

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