Merge pull request #109 from leiradel/fixed_ay38910_envelope_15

AY-3-8910 envelope 15 fix

Author: floooh

chips/ay38910.h

@@ -377,7 +377,7 @@ static const uint8_t _ay38910_shapes[16][32] = {
     // 1 1 1 0
     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
     // 1 1 1 1
-    { 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 };
 
 /* DC adjustment filter from StSound, this moves an "offcenter"