A 'sequence' is a virtual soundfile dynamically created in memory from a sequence definition. The sequence definition specifies the order and type of signals to sequence.
Sequence wave items are created using the option /Q.
A sequence is defined using the wave item command SIGNAL. Defined signals can then be filtered using the filter commands (see Filtering a Sequence). When signal definitions and filtering have been done, the sequence is finalized using the END command. The sequence can then be accessed like any other wave item.