i don't know how to whistle and i can't use my regular voice because the frequency will fluctuate a lot. when i make a low noise it says something like 24 khz but when i make a higher noise it says 440 hz so i can't really do this the way it was shown in the video, is there any other way i can do it?
oh yeah i do, thanks for... telling me that i have an instrument? or... reminding me?.. i don't know what this can be classified as
Wait I just remembered it didn't work, i think it was picking up higher frequencies than I wanted it to, and I couldn't find seem to find an instrument that was close enough to a pure sine wave (it's an electronic keyboard.) I think if I connect the keyboard to my computer I might be able to use the audio data from the keyboard output so there isn't any noise, then maybe it will work.
You shouldn't have to. MICROPHONE [FREQUENCY] should give you the fundamental (the lowest) frequency, the one that defines the note, regardless of the instrument timbre. (Exception: If the instrument is a cymbal, then you hear some harmonics before you hear the fundamental. But once the attack finishes, you'll hear the fundamental.)