                                  Screen #1

- Every question fits on one line. Answer only with keys listed in red on
  the screen's bottom line :
  - by a letter, either uppercase or lowercase,
  - by a numerical value,
  - by the left or right arrows.

- Line #1: for a first test, set a pause of computation between modules

- Line #2: the "Files" option allows to use a number of samples N two times
  higher, but the ability of displaying graphics is reduced (see the on line
  Notice, hitting "N" when the cursor is on the last screen's line).

- Line #3: controls the visualization mode of filters by module "Graphics":
              option  "LAST"  : last upstream filter,
              option   "ALL"  : cascade of all upstream filters.

- Lines #4 and #5: keep the nanosecond / MegaHertz couple for the pre-
  recorded canals



- Line #6: if a virtual disk is implemented in your computer, give its name
  here to stock temporary informations: the program will save them more
  quickly.

- Line #7: number of samples N. The program will warn you if you enter a too
  large value, depending of your PC memory.

- Line #8: you are proposed to load a pre-registered canal.
  You can choose another one hitting 999 at this line.

- Line #9: quitting the program is normally performed by hitting "q" at this
  line. Then, the screen #1 parameters are saved to be reused in the next
  session.
  During computation, you may quit the program without any saving process by
  hitting Ctrl c.






- The program returns to screen #1 after every canal computation. The value
  of module parameters (screens #2 and 3) are unchanged; so you can make
  a new computation with a different value of N, insert a pause between
  modules, etc.

- the PGUP key allows to access screens #2 and #3, the PGDN key comes back
  to screen #1.

