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Dennis, placing a stethoscope at the opening of the large chaff collector was essential in enabling me to discover 1C and 2C, and then later establishing the critical linkages between those sounds and the temperatures appearing on the GC display.

Once you have documented those critical linkages for you favourite beans (as described here)
http://www.homero...post_38248you would typically not be required to wear the uncomfortable stethoscope.