Audio Unit Issue 219DE61
There had been a behaviour change in iOS 11 which introduced a bug on iOS level,
causing Audio Unit plugins on iOS to render incorrect audio when doing a so called
"offline" render. An "offline" render is used by most Audio Unit capable DAW apps
by default when exporting songs from their apps as audio files. The symptoms
of this issue are that the generated audio files contain long passages of silence
and/or corrupt audio artefacts.
iOS Status
The mentioned behaviour change on iOS level seems to be intended to fix an
issue where a frozen Audio Unit could tear down the entire system. Unfortunately
this change also introduced the described bug when doing an "offline" render
with Audio Unit plugins on iOS.
Unfortunately for this particular bug on iOS level, there was no way for us to
provide a temporary workaround for our Audio Unit plugins, so we really had to wait for
Apple to react and address this issue on iOS level first.
In the meantime, Apple resolved this issue with iOS 11.3, but unfortunately
it also requires changes to all Audio Unit plugins and also requires changes
to all Audio Unit host apps (DAW apps). So simply updating your iPad / iPhone to
iOS 11.3 is not sufficient for the described symptoms to disappear.
Audio Units' Status
We addressed the required Audio Unit changes with
- iSymphonic Orchestra 2.1
- Colossus Piano 2.0
- Heavy Brass 2.0
- Oriental Strings 2.0
- iCathedral Organ 2.0
DAW Apps' Status
As previously mentioned, also all Audio Unit host apps (DAW apps) need to be updated for this issue to be finally resolved. This is the current status of Audio Unit capable DAW apps concerning this overall issue, as far as we know at this point:
Cubasis
Steinberg addressed this issue in Cubasis 2.4.1.
In case you cannot update to Cubasis 2.4.1 yet (i.e. on older iOS devices),
in case of Cubasis there exists a workaround for this
issue for a longer time already. This workaround will cause the audio render to
take much longer, but the audio result will be correct:
GarageBand
Apple resolved this issue with GarageBand 2.3.4.
Auria
WaveMachine Labs resolved this issue with Auria 2.220 and Auria Pro 2.22.
More Info
In case you have additional questions regarding this overall issue, or updates on the status of any app concerning this issue, feel free to contact us. We will update this page as soon as there are any noteworthy news on this overall issue.