Just wanted to follow up regarding this. As per the work-around the Douglas
Scott suggested below, I've implemented this successfully in my app and it
is working without issues.

For those who are unaware (as I was), the 'errno' value can simply be set
directly. By updating the "errno" value to 0 after a failed call,
subsequent calls to 'MusicSequenceFileLoad' generate a successful response.
Therefore, I've amended my code as follows:

OSStatus statusOfInitialAttempt =
(__bridge CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");if
(statusOfInitialAttempt == -1) {
    errno = 0;

    OSStatus statusOfSecondAttempt =
(__bridge CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");

    if (statusOfSecondAttempt == -1) {
        // Handle error case

Thanks Douglas for your help with this!



Date: Sun, 09 Oct 2016 22:15:03 -0700
> From: Douglas Scott <douglas_sc...@apple.com>
> To: Sven Thoennissen <bioch...@me.com>
> Cc: coreaudio-api@lists.apple.com
> Subject: Re: MusicSequenceFileLoad Returns -1 on iOS10
>         (AudioToolbox/MusicPlayer)
> Message-ID: <43be2217-7a15-4f03-9338-728acd0ff...@apple.com>
> Content-Type: text/plain; charset="utf-8"
> I cannot promise the specific release in which this will be fixed, but the
> problem is understood, and I can tell you that if you can force ‘errno’ to
> reset to 0, any following call to MusicSequenceFileLoadData() will succeed.
> -DS
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