I have one of those too that I can't wait to toss this year. I have heard that smallies in particular are very curious fish, maybe because craws are a staple in their diet, especially River fish.
To the results, I found that some baits showed a wider frequency range, while others had a more narrow range. Some baits were centered on the top of the range while others were centered on the bottom. Haven't analyzed the results fully yet, but the biggest test will be on the water.
I will say that comparing the RES, RES 2 Tap, XR 50, Bill Lewis Trap, and a Rattling Rap, they were all in the same frequency range, so that must be pretty important. Now of course some were louder, different rattle sound, but the frequencies were pretty consistent across brands. One thing I didn't do was test multiples of other brands to see if they were more consistent than the RESs.
This was a really interesting experiment, now I will let the fish finalize the results:)