# \[iOS\] Problems with mixerSuspend and mixerResume **URL:** \ **Category:** FMOD Engine\ **Tags:** ios, cpp\ **Created:** [April 19, 2025, 11:37am UTC](https://qa.fmod.com/t/ios-problems-with-mixersuspend-and-mixerresume/22820 "2025-04-19T11:37:53Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![li\_fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/li_fmod/32/6577_2.png) [@li\_fmod](https://qa.fmod.com/u/li_fmod)\ **Post date:** [April 24, 2025, 6:13am UTC](https://qa.fmod.com/t/ios-problems-with-mixersuspend-and-mixerresume/22820/2 "2025-04-24T06:13:46Z")
Hi, Thank you for sharing the detailed information and log output. > [@rhdr](#): > > ```auto > [LOG] SystemI::mixerResume : Resuming output. > [LOG] OutputCoreAudio::init : Hardware buffer size: 1024 samples, hardware sample rate: 48000Hz, hardware channels: 2 > [LOG] OutputCoreAudio::init : Maximum hardware read size: 4096 samples, Software buffer size: 512 samples, Number of software buffers: 4. > [WRN] OutputCoreAudio::init : DSP buffer size * DSP num buffers is potentially too small. > [LOG] SystemI::startDriver : Output requires a sample rate of 48000Hz, resampling will occur. > [LOG] Thread::initThread : Init FMOD mixer thread. Affinity: 0x4000000000000001, Priority: 0xFFFF7FFA, Stack Size: 81920, Semaphore: Yes, Sleep Time: 0, Looping: Yes. > > ``` These log messages suggest that the DSP buffer size may be insufficient. Could you please try using [System::setDSPBufferSize](https://fmod.com/docs/2.03/api/core-api-system.html#system_setdspbuffersize) to configure the buffer size to `(1024, 4)` before initializing FMOD, and check if the issue persists? Additionally, I found a related discussion that might be relevant to your case: [Event callbacks don't work if other audio is playing on iOS - #4 by Leah\_FMOD](https://qa.fmod.com/t/event-callbacks-dont-work-if-other-audio-is-playing-on-ios/22465/4) --- _[View the full topic](https://qa.fmod.com/t/ios-problems-with-mixersuspend-and-mixerresume/22820)._