With a candle you can only "measure" the air speed. This air speed is oscillating and its mean value is very low -the flame is not curved, no surprise there. Now the real questions are
-with the candle, can we see the oscillation in the air speed (for example, does the flame appear to be thicker when you play) ?
-with more relevance to the original question, is the pressure oscillation sufficient to compromise the seal of the lowest pads ?
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