From the help file in VSig, here is the description of the Sequencer module:
The sequencer module
is used to create a repetitive sequence of "mod" signal output values. This is
very useful in creating a pitch arpeggiator with a pitch shifter.
The sequencer
functions like a table lookup. A specified number of values are stored in
memory, and depending on the value of the audio input signal, the corresponding
value is sent to the output. To create a sequencer, a ramp waveform from an LFO
drives the input of the sequencer, producing a consistent pattern of output
values. (On the LFO, a ramp is a triangle with 100% duty cycle)
