From cc0cc9fb0c806f6533dca794b1e829a626323d8b Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Fri, 11 Sep 2009 16:54:06 +0000
Subject: Implement the fine tuning field, based on research.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1664
---
 src/i_oplmusic.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/i_oplmusic.c b/src/i_oplmusic.c
index 643f67c5..8cb833a2 100644
--- a/src/i_oplmusic.c
+++ b/src/i_oplmusic.c
@@ -839,6 +839,14 @@ static unsigned int FrequencyForVoice(opl_voice_t *voice)
 
     freq_index = 64 + 32 * voice->note + voice->channel->bend;
 
+    // If this is the second voice of a double voice instrument, the
+    // frequency index can be adjusted by the fine tuning field.
+
+    if (voice->current_instr_voice != 0)
+    {
+        freq_index += (voice->current_instr->fine_tuning / 2) - 64;
+    }
+
     // The first 7 notes use the start of the table, while
     // consecutive notes loop around the latter part.
 
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