as well as at A4, and the A4 beat may be beating at a different speed
than the beat at A4. Listen to these two filtered waveforms.
One is the F2Fork filtered around A4,
and the 2nd is the same wave form filtered around A5. Notice how the two speeds are different.
Beat Speed = 4.4 bps Beat Speed = 3.9 bps
In this example, the difference between the beat speeds at A4 and A5 is 14%. You should easily be able to hear that since you passed the beat speed difference
sensitivity test already at 3% or better.
Now play the unfiltered F2Fork waveform below.
A good aural piano tuner can discern that there are two different beat speeds
within the F2Fork sound. Try to hear the different A4 and A5 beat speeds within the unfiltered
F2Fork waveform. Trying to hear each separate beat speed for practice is good, but when tuning A4,
you must ignore the beating A5, especially if it is beating at a different speed.