Sonoro MAESTRO SO-1000 Mode D'emploi page 131

8. Step 1, you should hear a short while of test tone. Press 'NEXT' to continue.
9. In step 2, the test tone is played continuously for 50 seconds.
For the best result, we recommend walking around the room with the iPhone
in your hand to record the sound from multiple positions.
process last about 50 seconds.
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