Patent ID: 7523009

Claim:
An instrument having: a) a user controllable operating parameter having a number of possible user controllable parameter values; b) a further operating parameter which is at least partially dependent on the user controllable parameter and which has any of a number of possible further parameter values, each corresponding to a respective one of the user controllable parameter values; c) a memory for storing the possible further parameter values; d) a selector for selecting one of the further stored parameter values for the further operating parameter in response to the selection by the user of the associated user controllable parameter value and for controlling the instrument accordingly; e) whereby, if the selected user controllable parameter value is one for which there is no associated further parameter value stored in the memory, the instrument is operable to interpolate between further parameter values, stored in the memory, which correspond to user controllable parameter values in closest proximity to the selected user controllable parameter value to obtain a further parameter value corresponding to said selected user controllable parameter value; f) a tuner for enabling a user to adjust the selected further parameter value, after a given user controllable parameter value has been selected, to obtain an adjusted further parameter value; g) updating apparatus for updating the memory so that the adjusted further parameter value is selected if the given user controllable parameter value is again selected for the user controllable operating parameter.