Digi Booster PRO - DBM0 file format by Tap of Inv

DBM is Iff like format.  It means that module consists of hunks.  Each hunk
has a 4 bytes identification and after that hunk length (LWORD - 4bytes).

If  the  module  doesn't  consist  of  one  hunk, for example VENV - volume
envelope  hunk  that  will  mean  this  module  doesn't use volume envelope
effect.

These hunks DBM module should always consits of:
NAME, INFO, SONG, INST, PATT, SMPL

 Offset  Length

   0       4      |   ID "DBM0" - module identification
   4       2      |   tracker version:
                  |   eg. $0200 - version 2.00
   6       2      |   reserved
------------------------------------------------------------
   8       4      |   ID "NAME" - module name hunk identification
  +4       4      |   hunk length
  +8      44      |   mod name
------------------------------------------------------------
  ???      4      |   ID "INFO" 
  +4       4      |   hunk length
  +8       2      |   number of instruments in module
 +10       2      |   number of samples in module
 +12       2      |   number of songs in module
 +14       2      |   number of patterns in module
 +16       2      |   number of channels
------------------------------------------------------------
  ???      4      |   ID "SONG" - songs hunk identification
  +4       4      |   hunk length
 +12      44      |   song name 
 +56       2      |   number of orders for this song
 +58      ???     |   order list (words) NOTE: Each order list can use
                  |                            the same numbers of patterns.
------------------------------------------------------------
  ???      4      |   ID "INST" - instruments hunk identification
  +4       4      |   hunk length
  +8      30      |   instrument name
 +38       2      |   sample number used in this instrument
 +40       2      |   instrument volume
 +42       4      |   instrument finetune (stored in HZ)
 +46       4      |   instrument repeat start
 +50       4      |   instrument repeat length
 +54       4      |   flags:
                  |                        bit 0 set - forward loop uesd
                  |                        bit 1 set - ping pong loop uesd
------------------------------------------------------------
  ???      4      |   ID "PATT" - patterns hunk identification
  +4       4      |   hunk length
  +8       2      |   number of positions (rows) in pattern
 +10       4      |   size of packed data
 +14      ???     |   packed pattern data
------------------------------------------------------------
  ???      4      |   ID "SMPL" - samples hunk identification
  +4       4      |   hunk length
  +8       4      |   flags:
                  |                        bit 0 set - 8 bit sample
                  |                        bit 1 set - 16 bit sample
                  |                        bit 2 set - 32 bit sample
 +12       4      |   sample length
 +16      ???     |   sample data (unsigned)
------------------------------------------------------------
  ???      4      |   ID "VENV" - volume envelopes hunk identification
  +4       4      |   hunk length
  +8       2      |   how many volume envelope tables does this hunk contain
 +10       2      |   to which instrument this volume envelope data belongs
 +12     134      |   volume envelope data
------------------------------------------------------------