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-rw-r--r--src/mml_composemusic_mcp/lexer.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mml_composemusic_mcp/lexer.py b/src/mml_composemusic_mcp/lexer.py
index e5f08a8..ed0a26e 100644
--- a/src/mml_composemusic_mcp/lexer.py
+++ b/src/mml_composemusic_mcp/lexer.py
@@ -329,7 +329,7 @@ class Lexer:
num0 = self._read_number()
if self._peek() == ",":
self._advance()
- num1 = self._read_number()
+ num1 = self._read_signed_number()
raw = f"s{num0},{num1}"
self._emit(TokenType.SWEEP, f"{num0},{num1}", raw)
return