Use Non-Frames Version Previous Page Next Page
Zak Patch System

ziw, zkw, zaw, ziwm, zkwm, zawm

          ziw       isig, indx
          zkw       ksig, kndx
          zaw       asig, kndx
          ziwm      isig, indx[, imix]
          zkwm      ksig, kndx[, kmix]
          zawm      asig, kndx[, kmix]

Description

Write to a location in zk space at either i-rate or k-rate, or a location in za space at a-rate. Writing can be with, or without, mixing.

Initialization

indx – points to the zk location location to which to write.

isig – initializes the value of the zk location.

Performance

kndx – points to the zk or za location to which to write.

ksig - value to be written to the zk location.

asig – value to be written to the za location.

ziw writes isig into the zk variable specified by indx.

zkw writes ksig into the zk variable specified by kndx.

zaw writes asig into the za variable specified by kndx.

These opcodes are fast, and always check that the index is within the range of zk or za space. If not, an error is reported, 0 is returned, and no writing takes place.

ziwm, zkwm, and zawm are mixing opcodes, i.e. they add the signal to the current value of the variable. If no imix is specified, mixing always occurs, but if imix is specified, imix = 0 will cause overwriting, like ziw, zkw, and zaw, and any other value will cause mixing.

Caution: When using the mixing opcodes ziwm, zkwm, and zawm, care must be taken that the variables mixed to, are zeroed at the end (or start) of each k- or a-cycle. Continuing to add signals to them, can cause their values can drift to astronomical figures.

One approach would be to establish certain ranges of zk or za variables to be used for mixing, then use zkcl or zacl to clear those ranges.

Examples

instr 1
          zkw        kzoom, p8      ; p8 in the score line determines where 
                                    ; in zk space kzoom is written
endin 


instr 2
           zkw       kzoom, 7       ; always writes kzoom to zk location 7
endin

instr 3
  kxxx    phasor     1
  kdest   =          40 + kxxx * 16 ; This will write azoom to locations 40 to 55
          zaw        azoom, kdest   ; on a one second scan cycle
endin

Author

Robin Whittle
Australia
May 1997


Use Non-Frames Version Previous Page Next Page
Zak Patch System