[Imp] IT: Like our fix for old (Open)MPT versions, clamp the Vxx para…

…meter to V80 for files made with old Schism Tracker versions (see schismtracker/schismtracker#531).

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@21769 56274372-70c3-4bfc-bfc3-4c3a0b034d27

soundlib/Load_it.cpp

@@ -1135,6 +1135,10 @@ bool CSoundFile::ReadIT(FileReader &file, ModLoadingFlags loadFlags)
  // Example: ckbounce.it
  lastValue[ch].command = m.command;
  lastValue[ch].param = m.param;
+ // Fix handling of commands V81-VFF in ITs made with old Schism Tracker versions
+ // (fixed in https://github.com/schismtracker/schismtracker/commit/ab5517d4730d4c717f7ebffb401445679bd30888 - one of the last versions to identify as v0.50)
+ if(m.command == CMD_GLOBALVOLUME && m.param > 0x80 && fileHeader.cwtv >= 0x1000 && fileHeader.cwtv <= 0x1050)
+ m.param = 0x80;
  }
  }
  }