Catch a Wave substitution questions

You are omitting step 6. Use the tuning fork resonators do the following:

1. Record the frequency listed on each bar. How much do they differ?
2. Whack only one bar. Record what you hear.
3. Whack both bars. Record what you hear.
4. Whack only one bar, allow it to resonate for a few seconds, stop it by placing your had on it. Record what you hear.