MIES has different modes to automate the acquisition of multiple stimulus sets.
Indexing mode allows the acquisition of a range of stimulus sets across multiple channels and channel types (DA and TTL).
As stimulus sets can have a different number of sweeps, the natural question arises when to switch to the next stimulus set when acquiring data on multiple channels simultaneously. Locked indexing advances to the next stimulus set when the stimulus set with the most sweeps (currently acquiring, not globally) on all active channels is complete. Unlocked indexing advances to the next stimulus set on an individual channel when the active set on the same channel is complete. In both modes, the currently active set may automatically repeat while acquisition on the channel with the most combined sweeps proceeds to completion; locked indexing repeats and then indexes, while unlocked indexing indexes and then repeats.
Inner-Set randomization is currently broken with indexing.
Set randomization with indexing is not implemented.