diff --git a/AlgebraicDataflowArchitectureModel/models/JumpGame.model b/AlgebraicDataflowArchitectureModel/models/JumpGame.model
index 756ea7e..baf60d2 100644
--- a/AlgebraicDataflowArchitectureModel/models/JumpGame.model
+++ b/AlgebraicDataflowArchitectureModel/models/JumpGame.model
@@ -23,35 +23,38 @@
 }
 
 channel C1 {
-	in force(f, update1(f2, m2)) == f2
-	in mass(m, update1(f2, m2)) == m2
-	out acceleration(a:Tuple, update1(f2, m2)) == tuple(fst(f2) / m2, snd(f2) / m2)
+	ref onground(o, update1(f2, m2, o))
+	in force(f, update1(f2, m2, o)) == f2
+	in mass(m, update1(f2, m2, o)) == m2
+	out acceleration(a:Tuple, update1(f2, m2, o)) == if(o, tuple(fst(f2) / m2, 0.0), tuple(fst(f2) / m2, snd(f2) / m2))
 }
 
 channel C2 {
-	in position(p, update2(p2, g2)) == p2
-	in ground(g, update2(p2, g2)) == g2
-	out onground(o:Bool, update2(p2, g2)) == and(eq(g2, true), le(snd(p), 0.0))
+	ref onground(o, update3(a2, o))
+	in acceleration(a, update3(a2, o)) == a2
+	out velocity(v:Tuple, update3(a2, o)) == if(and(o, lt(snd(v), 0.0)), 
+													tuple(fst(v) + 0.01 * fst(a2), 0.0), 
+													tuple(fst(v) + 0.01 * fst(a2), snd(v) + 0.01 * snd(a2)))
 }
 
 channel C3 {
-	ref onground(o, update3(a2, o))
-	in acceleration(a, update3(a2, o)) == a2
-	out velocity(v:Tuple, update3(a2, o)) == if(and(o, lt(snd(v), 0.0)), tuple(fst(v) + 0.01 * fst(a2), 0.0), 
-																		 tuple(fst(v) + 0.01 * fst(a2), snd(v) + 0.01 * snd(a2)))
+	ref onground(o, update4(m2, o))
+	in move(m, update4(m2, o)) == m2
+	out velocity(v:Tuple, update4(m2, o)) == if(and(o, ge(snd(m2), 0.0)), m2, v)
 }
 
 channel C4 {
-	ref onground(o, update4(m2, o))
-	in move(m, update4(m2, o)) == m2
-	out velocity(v:Tuple, update4(m2, o)) == if(o, m2, v)
+	in velocity(v, update5(v2, g2)) == v2
+	in ground(g, update5(v2, g2)) == g2
+	out position(p:Tuple, update5(v2, g2)) == if(and(eq(g2, true), lt(snd(p) + 0.01 * snd(v2), 0.0)), 
+													tuple(fst(p) + 0.01 * fst(v2), 0.0), 
+													tuple(fst(p) + 0.01 * fst(v2), snd(p) + 0.01 * snd(v2)))
 }
 
 channel C5 {
-	ref onground(o, update5(v2, o))
-	in velocity(v, update5(v2, o)) == v2
-	out position(p:Tuple, update5(v2, o)) == if(and(o, lt(snd(p), 0.0)), tuple(fst(p) + 0.01 * fst(v2), 0.0), 
-																		 tuple(fst(p) + 0.01 * fst(v2), snd(p) + 0.01 * snd(v2)))
+	in position(p, update2(p2, g2)) == p2
+	in ground(g, update2(p2, g2)) == g2
+	out onground(o:Bool, update2(p2, g2)) == and(eq(g2, true), le(snd(p), 0.0))
 }
 
 channel C6 {