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frequency comparison

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New Member
hello... me again.... :p
rite.... does nebody have ne ideas on how to compare frequencys????
im trying to set a reference frequency that can be compared with a frequecny obtained from an external source (this case a guitar)
ive considered using beat frequencies, but i desperatly need some other options as i dont really seem to be gettin anywhere.....
help please..... :D
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