1. A method for processing physiologic data from a plurality of physiologic input sense channels monitored by a medical device, the method comprising: (A) determining by a processor a selection criterion for selecting from the plurality of physiologic channels; (B) dynamically selecting by a processor a first input sense channel subset of physiologic input sense channels from the plurality of physiologic input sense channels based on the selection criterion at a first time value; (C) retaining a first data sensed through the dynamically selected first input sense channel subset of physiologic input sense channels; (D) dynamically selecting by the processor a second input sense channel subset of physiologic input sense channels from the plurality of physiologic input sense channels based on the selection criterion at a second time value; (E) retaining a second data sensed through the dynamically selected second input sense channel subset of physiologic input sense channels; and (F) combining by the processor at least two of the selected input sense channel subsets of physiologic input sense channels into a composite channel, the combining based on a selection criterion associated with a characteristic of at least one of the plurality of physiologic input sense channels.