I think you may be using an old version of the manual. You can go to
   http://www.geocities.com/~csoundmanual
and download the manual in the format of your choice.

Specifically:
>f.i. inumber ilinrand 100 is not recognized.
ilinrand is now simply linrand and has been for some time.

>2)wgpluck2 always results in the
>message that there are too few
>parameters
According to the manual there are 5 arguments to wgpluck2. This agrees with the messages from the -z1 flag.

>3)doscil isn't recognized
I think this was never implemented. It's not in the current documentation.

It's difficult to tell from your description what is happening with nlfilt. Posting the relevant sections of the orc and sco would help. You must be careful with global variables. Make sure it is established before attempting to write to it. And that it is available for reading at the appropriate time.

-David.