Any resource to look at for recording playback audio?

I saw an example of recording audio from a mic, but I want to capture the audio output from a specific channel group or the master channel group and then save it to a file.

Could you tell me where to start?
At least, could you tell me any related function names?

One more question. Is it possible to capture the output audio silently as other professional audio apps’ export features do?

To capture the signal at a specific point in the DSP graph you’ll need to create a custom DSP. Take a look at the dsp_custom example we ship, then attach it to the desired ChannelGroup with addDSP.

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Thank you!