Add dynamic ramps to ly output

engine/items.py

@@ -2657,7 +2657,7 @@ class DynamicRamp(Item):
         """Get the complete velocity for a tickindex, without the base
         velocity from the dynamic Signature"""
         if self._cachedVelocity >= 0 and self._cachedTargetVelocity >= 0 and self._cachedTargetTick >= 0 and self._cachedTickIndex >= 0:
-            assert tickindex <= self._cachedTargetTick
+            #assert tickindex <= self._cachedTargetTick #not correct.
             #assert tickindex >= self._cachedTickIndex  #this creates problems with patterns which modify the tickindex while exporting.
 
             if self.graphType == "linear":
@@ -2682,6 +2682,10 @@ class DynamicRamp(Item):
             elif self._cachedVelocity < self._cachedTargetVelocity:
                 keyword = "cresc"
             #else it stays dyn-ramp.
+
+        #We export this so many times.. let's bake the variant into a variable for later lilypond export.
+        self._cacheKeywordForLilypond = "\\<" if keyword == "cresc" else "\\>"
+
         return {
             "type": "DynamicSignature",
             "graphType" : self.graphType,
@@ -2692,6 +2696,16 @@ class DynamicRamp(Item):
             "UIstring" : keyword,
             }
 
+    def _lilypond(self, carryLilypondRanges):
+        """
+        Lilypond Dynamics are postfix.
+
+        Don't export anything directly, but add the dynamic keyword to the lilypond ranges dict
+        so the next chord can use it as postfix. """
+        carryLilypondRanges["DynamicSignature"] = self._cacheKeywordForLilypond
+        return ""
+
+
 class LegatoSlur(Item):
     def __init__(self):
         super().__init__()