v.14

To pass this unit, you must use an ETD to tune A4 using DSU.

Notes:
Send in a video.
Narrate as you tune. Let us know what you are thinking.
Start at least 4 cents flat.
Use iStroboSoft or equivalent and show the ETD to the camera.
Only look at the ETD when measuring a clean DSU.

Submission Steps:

1. Mute the right string of A4.
2. Clean up the DSU.
3. Measure it with the ETD*.
4. Move one string of the DSU and make the DSU out-of-tune by the amount that the ETD says it was out from 440 Hz.
5. Move the other string and make the DSU clean again.
   Go back to step 3 and measure the A4 again.
   Keep doing steps 3, 4, and 5 until the A4 DSU is 440 Hz +/- 1 cent.
6. Remove the mute.
7. Tune the third string clean to the DSU.
8. Play A4 moderately loud, 3 – 4 seconds.
9. Play A4 3 times very loud to test stability.
10. Play A4 again moderately loud and let it sustain for 3 – 4 seconds.

* Always show the ETD to the camera.