From d1e306077ff111e148400a0202b548ce9ed3d7bc Mon Sep 17 00:00:00 2001
From: Stepan Moskovchenko <stevenm@rockbox.org>
Date: Sat, 29 Sep 2007 02:20:49 +0000
Subject: [PATCH] MIDI: Fix two year old loop bug that caused distortion on
 some instruments. I been looking for this one for at least 6 months.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14896 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/midi/synth.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/apps/plugins/midi/synth.c b/apps/plugins/midi/synth.c
index d053ebf535..d6fda78aab 100644
--- a/apps/plugins/midi/synth.c
+++ b/apps/plugins/midi/synth.c
@@ -297,13 +297,13 @@ signed short int synthVoice(struct SynthObject * so)
     {
         if(wf->mode & LOOP_REVERSE)
         {
-            so->cp = (wf->endLoop)<<FRACTSIZE;
-            cpShifted = wf->endLoop;
+            cpShifted = wf->endLoop-(wf->startLoop-cpShifted);
+            so->cp = (cpShifted)<<FRACTSIZE;
             s2=getSample((cpShifted), wf);
         }
         else
         {
-            so->delta = -so->delta;
+            so->delta = -so->delta; /* At this point cpShifted is wrong. We need to take a step */
             so->loopDir = LOOPDIR_FORWARD;
         }
     }
@@ -313,8 +313,8 @@ signed short int synthVoice(struct SynthObject * so)
         so->loopState = STATE_LOOPING;
         if((wf->mode & (24)) == 0)
         {
-            so->cp = (wf->startLoop)<<FRACTSIZE;
-            cpShifted = wf->startLoop;
+            cpShifted = wf->startLoop + (cpShifted-wf->endLoop);
+            so->cp = (cpShifted)<<FRACTSIZE;
             s2=getSample((cpShifted), wf);
         }
         else