Audio Crackling

I'm pretty sure that if the audio is crackling, the fault lies at synchronization between graphics and audio. There's nothing wrong with the audio processing. It's the way of how to control the 'buffer rate' of the audio sample. This is happens when the audio input buffer rate is not as longer enough that it can handle the input load as well as the audio output buffer rate is not as shorter enough to synchronize with graphic. There are three types of audio buffer; a buffer on audio inputs, buffer on audio reading and buffer on audio outputs. Usually buffer on audio reading can't be control.

With the current build of rpcs3, there's no extensive settings to control audio buffer rate internally. Luckily with my experience on dealing other kind of consoles emulators, I found out that audio buffer rate also can be control with audio manager or system mixer. With a central audio manager that can control the audio api and buffer rate on your computer, rpcs3 doesn't need to process audio internally which lessen the load of processing in rcps3.

For examples, in windows platform, there is VB-audio which is a donation-ware program. It is excellent in handling audio buffer rate. For your info, windows has different audio APIs. There are MME, KS, WASAPI and ASIO. This program can also choose among these API to work with. Don't worry if you know nothing on how to use this program because it comes with a manual.

I'm sure that there is other program such as vb-audio for linux platform but, I don't know about it because I'm a windows user.