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-rw-r--r--opl/examples/droplay.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/opl/examples/droplay.c b/opl/examples/droplay.c
index af1a59d9..5f09fe11 100644
--- a/opl/examples/droplay.c
+++ b/opl/examples/droplay.c
@@ -39,6 +39,15 @@ void WriteReg(unsigned int reg, unsigned int val)
{
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)