Compression is always disabled when in IQ mode. Another way of looking at it is to observe the network transfer rates for the audio data: 6 kB/s regular mode (4:1 ADPCM compressed, non-IQ, mono) 24 kB/s compression off 48 kB/s IQ (no compression, stereo)
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6 kB/s regular mode (4:1 ADPCM compressed, non-IQ, mono)
24 kB/s compression off
48 kB/s IQ (no compression, stereo)