Question / Help Uncompressed audio using Custom Output settings?

I'm a music streamer and I'd like to record audio at a higher quality level than the default, ideally
uncompressed 24bit 48kHz. My understanding is you can do this with Custom Output FFmpeg.

Does anyone have advice on how I can retain my current video settings (container/quality/filesize) with FFmpeg and how to set the audio? Thanks!

Current Settings (advanced output mode):
Recording Format: FLV
Encoder: x264
Rate Control: CRF
CRF: 18
Keyframe Interval: 0 (auto)
CPU Usage: superfast

Desired Settings:
Same or equivalent video settings (FLV container)
24bit 48kHz uncompressed audio
 
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