Noise Packer v2 format
Created by Twins / Phenomena (1990)
Analysed by Asle / ReDoX (asle@mygale.org)

Source:
 -three NP2 packed files sent by Gryzor ! (thx)
 -the original packer sent, also, by Gryzor !!!.
 -tons of intros/demos/musicdisks ...

Note: It's the very same as NoisePacker v1 save for the loop start value
     which is, here, /2. Also, maybe something around Set filter effect ..
     not sure, though.

Offset    size (byte)    Comment
------    -----------    -------
  0           2          Number of sample + $C.
                         
  2           2          Size of pattern list
                         (/2 to get real size)

  4           2          ?!?

  6           2          track data size

      ***************************************
      * the following is repeated NOS times *
      * with 16 bytes description for 1 smp *
******************************************************
                                                     *
  8            4         ?!?                         *
                          (looks like it's always)   *
                          (four 00h ...)             *
 12 (Ch)       2         Sample Size / 2             *
 14 (Eh)       1         Finetune (0 -> F)           *
                          (U sure gryzor ???)        *
 15 (Fh)       1         Volume (0 - 40h)            *
 16 (10h)      4         ???                         *
                          (looks like it's always)   *
                          (four 00h ...)             *
 20 (14h)      2         Loop Size / 2               *
 22 (16h)      2         Loop Start / 2              *
                                                     *
******************************************************


  ?            2         Size of pattern list (again !?)

  ?            2         ?!?

  ?            ?         Pattern list (words) (*8)

  ?            ?         Track list per pattern. 2 bytes for one track
                         address and then, 8 bytes for one pattern.
                         Since the track datas begin right after, you have
                         to add TDA (track data address). This TDA is the
                         number of bytes you'll have read AFTER this list.
                         You can calculate it if you want ... that way:
                         8 + (NumberOfSample*16) + 4 + (PatternListSize*2)

Note: Beware because this list is reversed !. Meaning that one pattern first
     contains the address of its track 4, then of track 3 ... .

 TDA            ?        Track datas. Each track is saved after another
                         and is 192 (C0h) bytes long.

* Each track consists of 64 notes, 3 bytes each.
* Follows the description of one note :


           sample number
          /   \
         |     |
 0000 0000  0000 0000  0000 0000
 |      |        |  |  |       |
  \    /          \/    \     /
 relative       effect   effect
 note nbr              parameter

NOTE : About 'relative note number', in fact, all the 8 bits are used
      but I pictured only the last 7 ones to show the use of the first
      bit by the sample number. The correct value for this note number
      can be obtained like that : Byte&FEh. Below is the complete table
      and you can see that all the value are *2 ... so first bit is
      never used.

NOTE : The Arpeggio effect is remapped to the effect number #8.
       The Volume slide effect is remapped to the effect number #7 BUT with
        signed value !! (7FE -> A01). Now, don't forget to place correctly
        the slide up ... so when converting just donc forget to <<4 !
       (704 -> A40)
       The Vibrato + Volume slide effect (6) is signed !. So, same as
        volume slide : 6FA -> 606  and  604 -> 640
       The Portamento + Volume slide effect (6) is signed !. So, same as
        volume slide : 6FA -> 606  and  604 -> 640
       The set filter command (E0) is changed (E02 -> E01)
       The pattern jump 'seems' to be *2 and starts at FC !. So jump to
        pattern 0 is BFC, to pattern 1 BFE, to pattern 2 B00 etc. ... .


Protracker note period table

C-1 to B-1 : 856,808,762,720,678,640,604,570,538,508,480,453
C-2 to B-2 : 428,404,381,360,339,320,302,285,269,254,240,226
C-3 to B-3 : 214,202,190,180,170,160,151,143,135,127,120,113

Noisepacker v2 relative note numbers

C-1 to B-1 : 02,04,06,08,0a,0c,0e,10,12,14,16,18
C-2 to B-2 : 1a,1c,1e,20,22,24,26,28,2a,2c,2e,30
C-3 to B-3 : 32,34,36,38,3a,3c,3e,40,42,44,46,48


 Follows Sample datas stored like Protracker.
Nothing is packed..