Are you using the C API or the Objective C API? Why do you have multiple 16-channel MIDISynth units running? You could possibly run out of CPU because they cannot steal voices from each other.
If your MIDISynth code works for one bank but not another, I find it hard to imagine it is a configuration issue. Can you point me to the banks in question? -DS > On Jul 3, 2018, at 3:02 PM, Bartosz Nowotny <bartosznowo...@gmail.com> wrote: > > Hello > > I need advice on how to properly configure AudioUnits in my MIDISynth iOS app. > > In my code I start by configuring AudioSession: I set the right category > (playback), preferred sample rate and buffer size and then start the session. > Next up, I create the graph: multiple synth units > (kAudioUnitSubType_MIDISynth) -> multichannel mixer -> remote IO. > For mixer unit, I configure number of input elements (buses) and maximum > frames per slice. > For synth units, I configure the soundbank URL and maximum frames per slice. > > This set up is enough for my app to successfully produce music by sending > MIDI note on/off events to specific synth units. For some soundfonts, the > produced sound is not correct, as if it was distorted. Because the soundfonts > I'm using are popular and publicly available soundfonts, tested on multiple > devices and different synths, I'm pretty certain the soundfonts are not at > fault here. My best guess is that I'm missing parts of the configuration: > > 1. Is any additional configuration required for any of the AudioUnits I use? > In particular, should I configure synth units output stream format, so that > for instance, the sample rate matches what is actually used by the hardware? > Should I also configure stream format for the mixer or IO units? How should > the stream format configs look like? > 2. If I do need to do the above configuration, how should I respond to audio > session route changes? I noticed, for instance, that plugging in headphones > changes the hardware output sample rate from 48kHz to 44.1kHz. > > Regards, > Bartosz > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/douglas_scott%40apple.com > > This email sent to douglas_sc...@apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to arch...@mail-archive.com
