Wood Tap Tone Reference Tool......
(Modified 2/2018)
Page TTT_13
.Everything I am teaching about tap tone technology revolves around the use of this Wood Tap Tone Reference Tool. You WILL need this reference tool to do accurate work!
..As viewed from one end, you see that it is made of two pieces of quarter sawn spruce (growth lines vertical), and glued together the same as a bass bar is glued inside a top plate. The tapered, straight sided bass bar like center strip is 0.225" wide (approximately 5mm) and 22 3/16" long. The short end is 0.30" tall and the tall end is 0.60" high.
..The sound board is 3" X 24 1/2" X 0.150" thick.
..You need to make this of quarter sawn spruce wood . (Same type of wood the top plate is made of.)
..Notice that we will be marking the tool every (5) HZ, with useful tap frequencies:
(164.176, 198, 213, 242,287 HZ) noted separately.
..All parts of the violin will be adjusted to one of these tap tone frequencies.
..Now, in order to calibrate your new wood reference tap tone tool, I am going to let you listen to this recording in which I tap my tone reference tool on each of the reference frequencies as well as the special points that are at: 162 HZ, 176 HZ, 198 HZ, 213 HZ, and 242 HZ. {176 HZ abd 198 HZ are close to a tuned piano F and G below middle C.} These I am recording with my very accurate Zoom recorder. Click here on on box below to hear these tap tones. Listen to the digital tap recording and then find the same spot on your reference tool and mark it as in the above photo.
...Click here to hear my Zoom recording of the various frequencies to calibrate your wood tap tone reference tool. Mark your tool as above in photos...
..Please note: This file is in wave format (required by my old program) and consequently must be 60 Megabyte size, so it is going to take a while to load (depending on your internet speed). Please wait for it to load and then save it to your computer (if possible, for future use). You will probably only have to use it once to calibrate your new wood tap tone reference tool.

(c) 2017 David Langsather, Salem, Oregon, USA
..If you want, you can glue four felt or neoprene buttons on the back side 22.4% in from each end, and from each outside edge.
..This will give the best tap response and clearest tap tones.
..As a further design detail; please make the parts of wood on the 'Wood Tone" scale and with "Rub Tone" of # 22 or as close as possible. This will really help the sound to come alive for you and make your job easier! (2017)
...Click here to hear see a you tube video demonstrating how to use your wood tap tone reference tool.
..Click here for detailed side detail of bass bar shape and probable depth details...
...Now add the Tap Tone/ Wood Tone Scale frequencies to your reference tool.