The method 1, wherein {HEAD ~ the two different frequencies} are {TAIL ~ a first frequency} of about 1 to about 100,000 Hz and a second frequency of about 0.0001 to about 10 Hz and the second frequency is lower that the first frequency 
The method 1 , wherein { HEAD ~ the two different frequencies } are { TAIL ~ a first frequency } of about 1 to about 100,000 Hz and a second frequency of about 0.0001 to about 10 Hz and the second frequency is lower that the first frequency
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH