"You can put on the headphones now."
"We're now going to calibrate the microphone. Throughout the experiment, please speak at a comfortable volume. In just a second, you will start hearing noise played through the headphones. When you do, say the word "head" with the vowel very long. Like this: "heeeeead". You may need to say "head" a couple times."
check_audioLevels then click Part B.
- Turn on SPL meter and press Fast/Slow and Level.
- Adjust the microphone gain on the red Focusrite (the "experiment mic" knob) until the SPL meter reads 78~82 dB.
- Press spacebar to stop.
- Turn off SPL meter