Speed is a parent element for two subelements: speedDesignated and varispeedAdjustment. The playback speed of the described object. Do not confuse with SAMPLE RATE.
Speed - Speed Designated
AES 126.96.36.199.2.4 (speedDesignated)
The nominal playback speed for the described audio object.
The speedDesignated value varies by format but is comprised of a decimal number followed by a unit of measure, e.g., rpm (revolutions per minute), ips (inches per second), or fps (feet per second). When designated speed varies within the resource or cannot be determined, use one of the following terms if applicable: varying; unknown.