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DRC Update produces a hard crack and then disables audio

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Comments

  • RichtownsRichtowns

    Glad to help. Good luck

  • sinosoidalsinosoidal
    edited January 2019

    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

  • reziduerezidue

    This is great to hear!

  • kinkujinkinkujin

    @sinosoidal said:
    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

    Ok, this is good news. Please keep us posted!

  • sinosoidalsinosoidal

    @kinkujin said:

    @sinosoidal said:
    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

    Ok, this is good news. Please keep us posted!

    There is a new version 2.0.1 (build 100) available for testing which hopefully fixes this problem. Who wants to try it?

  • reziduerezidue

    The burst is not happening! Although I see some residual audio kicking up after playing a bunch of notes. Check out this video when I start playing around C5.

    https://streamable.com/u9p07

  • MonkeyDrummerMonkeyDrummer

    Damn thing just about deafened me last night when I tried it with my headphones on!!!

  • 1nsomniak1nsomniak

    Must resist the morbid curiosity to make tha damaging sound, why is it so tempting?!

  • rs2000rs2000

    @sinosoidal said:
    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

    I have seen very similar behaviour in other apps too, and I think that it's not "only a DRC bug" but an issue with lower layers like iOS audio too.
    Avoiding loud cracks generated by a synth is one thing, but the audio system should never end up in a state that it remains dead even with other apps.

    So here's my question to @sinosoidal
    What have you done to fix the bug? Limit output levels?
    What exactly causes iOS audio to go silent? DC offset maybe?
    This should really be described and forwarded to Apple's iOS dev team.

  • [Deleted User][Deleted User]
    The user and all related content has been deleted.
  • SevenSystemsSevenSystems

    I've had this happen while I developed an algorithmic reverb, and yes, it was due to accumulating DC offset in the feedback loop. Maybe there's an overflow somewhere in CoreAudio when extremely large values occur, and it crashes? CoreAudio also does some final processing (limiter, etc.) before the output so maybe that gets confused... hard to say. The accumulating DC offset would of course be a bug in the client application, but the audio permanently shutting off due to it is of course an Apple problem :)

  • RichtownsRichtowns

    @rezidue said:
    The burst is not happening! Although I see some residual audio kicking up after playing a bunch of notes. Check out this video when I start playing around C5.

    https://streamable.com/u9p07

    Yep, Me too.

    It doesnt seem to happen with only one note but two notes at the same time (or maybe the portamento?!) and this weird (can be up to 10s) echo happens. And this does seem to tie into what @SevenSystems is saying. Im sure together we can work it out

  • kinkujinkinkujin

    Good to see this progress. I've been a bit tentative to dig in since my first experience. Thanks for staying on it you all.

  • [Deleted User][Deleted User]
    The user and all related content has been deleted.
  • sinosoidalsinosoidal

    @rs2000 said:

    @sinosoidal said:
    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

    I have seen very similar behaviour in other apps too, and I think that it's not "only a DRC bug" but an issue with lower layers like iOS audio too.
    Avoiding loud cracks generated by a synth is one thing, but the audio system should never end up in a state that it remains dead even with other apps.

    So here's my question to @sinosoidal
    What have you done to fix the bug? Limit output levels?
    What exactly causes iOS audio to go silent? DC offset maybe?
    This should really be described and forwarded to Apple's iOS dev team.

    The bug was caused by an invalid memory access. It should be fixed on version 2.0.1 that has been released today.

  • reziduerezidue

    @sinosoidal said:

    @rs2000 said:

    @sinosoidal said:
    I think > @Richtowns said:

    I was curious so I had a go at recreating this so I played around with DRC in Aum for quite a while with no problems. So then I decided to load the infavous reese patch and boom! Nasty shrill momentry noise and then the audio is broken in Aum.

    I can recreate this in Aum, it has done the same three times in a row on my iPad Air 2 running latest iOS 12.1.1. Steps
    Load DRC as auv3 in aum and load the reese patch
    Load Roseta Bassline and add three C notes, one which has a tie for an extra note.
    Link bassline to DRC and press play.

    Good luck @sinosoidal

    Your feedback was crucial. I was able to track down the bug with this replicable use case. I think I have nailed it. Requires more extensive testing but I have been playing a lot of patches for a long time and it has been steady! :sweat_smile:

    I think I will only be able to deploy a new beta in the beginning of the next week as we have just entered weekend and new versions require human review from Apple.

    Thank you all for your feedback and support! :blush:

    I have seen very similar behaviour in other apps too, and I think that it's not "only a DRC bug" but an issue with lower layers like iOS audio too.
    Avoiding loud cracks generated by a synth is one thing, but the audio system should never end up in a state that it remains dead even with other apps.

    So here's my question to @sinosoidal
    What have you done to fix the bug? Limit output levels?
    What exactly causes iOS audio to go silent? DC offset maybe?
    This should really be described and forwarded to Apple's iOS dev team.

    The bug was caused by an invalid memory access. It should be fixed on version 2.0.1 that has been released today.

    Working great over here! Can’t duplicate. Nice job ironing it out. Really happy to have it as AU.

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