Frank, I did not mean to imply that RCT's were not properly calibrated. Even though the separate quartz tone source supplied with the RCT is inexpensive, it may still be very accurate. (After all, providing a single accurate tone reference is the only job it has to do!) I only raised the issue in order to highlight where the accuracy was coming from. It cannot come from anything within a PC because the makers of PCs and soundcards do not take the trouble to ensure that any of their clocks have absolute accuracies better than 2 cents. Any tuning program running in a general-purpose PC must be calibrated at some time in their life to an external reference. PC tuning programs do work off an internal clock in the computer, but only after the program has taken into account the calibration error of that internal clock. Frank Cahill wrote: >...I find that very interesting. If you are correct, there could >be alot of RCTs that are not properly calibrated. I assumed that the >RCT worked off an internal clock in the computer. -Bob Scott Ann Arbor, Michigan
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