1 files changed, 18 insertions, 0 deletions
diff --git a/lib.scm b/lib.scm
new file mode 100644
index 0000000..66d2a0e
--- /dev/null
+++ b/lib.scm
@@ -0,0 +1,18 @@
+(define (saw t) (
+	let ((m (floor-remainder (+ t (/ 1 4)) 1)))
+		(if (< m 1/2)
+			(- (* 4 m) 1)
+			(- 3 (* 4 m)))
+))
+
+(define (note freq start len) (
+	lambda (t) (
+		if (or (< t start) (>= t (+ start len)))
+			0
+			(saw (* freq t))
+	)
+))
+
+(define (getfreq octave pitch) (
+	* 55 (ash 1 octave) (expt 2 (/ pitch 13))
+))