diff --git a/sineex.py b/sineex.py
index 9bc51de..b554ce3 100644
--- a/sineex.py
+++ b/sineex.py
@@ -1,4 +1,4 @@
-ln = s.sec(4)
+ln = s.sec(6)
 
 s.endtick(ln)
 
@@ -9,10 +9,12 @@ left.setpos(0, -0.3, 0, 0)
 right.setpos(0, 0.3, 0, 0)
 
 tr1 = s.node()
-tr1.setbasefreq(ln, s.note("C4"))
+tr1.setbasefreq(0, s.note("E4"))
+tr1.slidebasefreq(s.sec(2), s.sec(4), s.note("E4"), s.note("C4"))
+tr1.setbasefreq(s.sec(4), s.note("C4"))
 tr1.sine(0, ln)
 tr1.setgain(0, 0.3)
 
 tr1.setpos(0, 100, 0, 0)
-s.air(tr1, [left])
-s.air(tr1, [right])
\ No newline at end of file
+s.wire(tr1, [left])
+s.wire(tr1, [right])
\ No newline at end of file
diff --git a/zigsonnum/activity.zig b/zigsonnum/activity.zig
index 4d2bdf0..bc9d990 100644
--- a/zigsonnum/activity.zig
+++ b/zigsonnum/activity.zig
@@ -255,7 +255,10 @@ pub const Activity = struct {
 		const startfreq = self.operands[0];
 		const endfreq = self.operands[1];
 		
-		const freq = utility.interpolate(current_tick, start_tick, end_tick, startfreq, endfreq);
+		const x = (current_tick * (current_tick / 2)) - (start_tick*current_tick);
+		const xx = ((endfreq - startfreq) / (end_tick - start_tick)) * x;
+		const freq = ((startfreq * current_tick) + xx) / current_tick; 
+		
 		try self.soundnode.s("basefreq", freq);
 	
 	}