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Set channel bits for OPL3 so that OPL2 traces will play back properly.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1537

--- a/opl/examples/droplay.c

+++ b/opl/examples/droplay.c

@@ -39,6 +39,15 @@

 {

     int i;

+    // This was recorded from an OPL2, but we are probably playing

+    // back on an OPL3, so we need to enable the original OPL2

+    // channels.  Doom does this already, but other games don't.

+

+    if ((reg & 0xf0) == OPL_REGS_FEEDBACK)

+    {

+        val |= 0x30;

+    }

+

     OPL_WritePort(OPL_REGISTER_PORT, reg);

     for (i=0; i<6; ++i)