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On sound card, Set the first knob all the way to the right.

3.1

Ask patient to produce a comfortable /a/

Check gain to flashing green line -12 to -24
If patient's comfortable /a/ is close to the upper range, lower the gain

check if we have to regulate the nivel de reproducción.
and how we decide to adjust the gain

adjust in audacity (ideally always the same)
adjust in soundcardLOUDER A:

Si sale ROJO, regular (Incorrecto! Sonido muy saturado):

3.2

Ask patient to say a louder /a/ to make sure it's still within range.

visual cue: flat upper limit on the waveform

4. SNR