<HTML>  list   Learned from my Dad a strict (Braid white Taught) aural tuner. Tuned aurally for 11 yrs. 19 years with etd's.   I have used all versions of the Sanderson devices.  I currently use a Sat 3 but my ears are always turned on except on the initial pitch raise in which I use ear plugs. The etd has preserved my hearing for (older age) the fine tuning part of the business!!!!!!!      Dale Erwin</HTML>