Merge branch 'master' of https://github.com/tildearrow/furnace into es5506_alt

papers/format.md

@@ -32,6 +32,7 @@ these fields are 0 in format versions prior to 100 (0.6pre1).
 
 the format versions are:
 
+- 139: Furnace dev139
 - 138: Furnace dev138
 - 137: Furnace dev137
 - 136: Furnace dev136
@@ -403,6 +404,14 @@ size | description
  --- | **a couple more compat flags** (>=138)
   1  | broken portamento during legato
   7  | reserved
+ --- | **speed pattern of first song** (>=139)
+  1  | length of speed pattern (fail if this is lower than 0 or higher than 16)
+ 16  | speed pattern (this overrides speed 1 and speed 2 settings)
+ --- | **groove list** (>=139)
+  1  | number of entries
+ ??? | groove entries. the format is:
+     | - 1 byte: length of groove
+     | - 16 bytes: groove pattern
 ```
 
 # patchbay
@@ -472,6 +481,9 @@ size | description
      | - a list of channelCount C strings
  S?? | channel short names
      | - same as above
+ --- | **speed pattern** (>=139)
+  1  | length of speed pattern (fail if this is lower than 0 or higher than 16)
+ 16  | speed pattern (this overrides speed 1 and speed 2 settings)
 ```
 
 # chip flags