xscansmap — Allows the position and velocity of a node in a scanned process to be read.
iscan -- which scan process to read
iwhich (optional) -- which node to sense. The default is 0.
kpos -- the node's position.
kvel -- the node's velocity.
kamp -- amount to amplify the kpos value.
kvamp -- amount to amplify the kvel value.
The internal state of a node is read. This includes its position and velocity. They are amplified by the kamp and kvamp values.
More information on Scanned Synthesis (as well as several other matrices) is available on the Scanned Synthesis page at cSounds.com.
Also an article on these opcodes: http://www.csounds.com/stevenyi/scanned/yi_scannedSynthesis.html , written by Steven Yi