diff --git a/glslview.c b/glslview.c
index 26c9f22..730032b 100644
--- a/glslview.c
+++ b/glslview.c
@@ -261,7 +261,20 @@ static void handle_input(const char *input) {
 			break;
 
 		case '=':
-			speed = 1.0;
+			if (speed < 0)
+				speed = -1.0;
+			else
+				speed = 1.0;
+			break;
+
+		case '<':
+			if (speed > 0)
+				speed = -speed;
+			break;
+
+		case '>':
+			if (speed < 0)
+				speed = -speed;
 		}
 	}
 }