diff --git a/audio.lua b/audio.lua
new file mode 100644
index 0000000..9866abf
--- /dev/null
+++ b/audio.lua
@@ -0,0 +1,111 @@
+local love = love
+local passChimes = {}
+local failChimes = {}
+local drones = {}
+local N = 8
+
+local function StartDrones()
+  love.audio.setEffect( "droneReverb", {
+      type = "reverb",
+      volume = 1.0, }
+
+)
+
+  drones.bass = love.audio.newSource("sounds/drone.flac", "stream")  
+  drones.alto = love.audio.newSource("sounds/drone.flac", "stream")
+  drones.bass:setVolume( 0 )
+  drones.bass:setPitch( 0.25 )
+  drones.alto:setVolume( 0 )
+  drones.bass:setPitch( 0.5 )
+  drones.bass:setEffect( "droneReverb", true )
+
+  love.audio.play( drones.bass )
+  love.audio.play( drones.alto )
+end
+
+love.audio.setEffect( "passChimeReverb", {
+    type = "reverb",
+    volume = 1.0, } )
+
+local passChime = love.audio.newSource("sounds/chimeb.flac", "static")
+passChime:setEffect( "passChimeReverb", true )
+local failChime = love.audio.newSource("sounds/chime.flac", "static")
+failChime:setEffect( "passChimeReverb", true )
+
+for i = 1, N do
+  passChimes[i] = passChime:clone()
+  failChimes[i] = failChime:clone()
+end
+
+local idxNextPassChime = 1
+local idxNextFailChime = 1
+local function GetNextPassChime( pass )
+  idxNextPassChime = idxNextPassChime % N + 1
+  return passChimes[ idxNextPassChime ]
+end
+
+local function GetNextFailChime( pass )
+  idxNextFailChime = idxNextFailChime % N + 1
+  return failChimes[ idxNextFailChime ]
+end
+
+local pitches = 
+{
+  1,
+  2/3,
+  3/2,
+  9/8,
+  27/16,
+  81/64,
+  243/128,
+  2 --Safety
+}
+
+local function GetPitch( th )
+  th = 0.5 + 0.5 * th / math.pi
+  return pitches[ 1 + math.floor( th * 7 )]
+end
+
+local function OnImpact( impact, score, pass, level )
+
+  --
+  if not pass then
+    --drones.bass:seek( level )
+    -- drones.alto:seek( level )
+  end
+
+  local th = impact.th
+  local r = impact.r
+
+  -- Chimes 
+  local chime = pass and GetNextPassChime() or GetNextFailChime()
+  chime:setPitch( GetPitch( th ) )
+  chime:setPosition( r * math.cos( th ), r * math.sin( th ) )
+  local highgain = math.max( 0, math.min( score, 1.0 ) - (pass and 0.0 or 0.5))
+  chime:setFilter{
+    type = "lowpass",
+    volume = 0.5 * impact.speed,
+    highgain = highgain,
+  }
+  love.audio.stop( chime )
+  love.audio.play( chime )
+
+end
+
+--score is the hypothetical "beat score" that would be attained
+--if an impact took place at this instant.
+local function Update( score )
+  drones.bass:setVolume( 0.5 * math.sqrt( score ) )
+  --drones.alto:setVolume( 0.3 * score )
+end
+
+local function Reset( )
+  for i = 1, N do
+    love.audio.stop( passChimes[i] )
+    love.audio.stop( failChimes[i] )
+  end
+  StartDrones()
+end
+
+Reset()
+return { OnImpact = OnImpact, Update = Update, Reset = Reset}
\ No newline at end of file
diff --git a/main.lua b/main.lua
index 9039522..5956b11 100644
--- a/main.lua
+++ b/main.lua
@@ -4,12 +4,12 @@ local sitelenpona
 local text
 local marble
 local wave
+local particles
+local audio
+local recorder
 local DetectCollision
-
-local sounds = {
-
-
-}
+local OnImpact
+local OnVictory
 
 
 local state 
@@ -52,17 +52,52 @@ function love.load()
 
   love.graphics.setBackgroundColor( 245 / 255, 169 / 255, 184 / 255 ) --Trans pink.
   --love.graphics.setBackgroundColor( 91 / 255, 206 / 255, 250 / 255 ) --Trans blue.
-  sounds.goodPing = love.audio.newSource("sounds/soundTest.ogg", "static")
-  sounds.badPing = love.audio.newSource("sounds/chime8.ogg", "static")
+
+  do--particle system setup
+    particles = love.graphics.newParticleSystem(
+      love.graphics.newImage( "prideflag.png" ),
+      1024)
+
+    particles:setSizes( 0.00015, 0.0001, 0.00018 )
+    particles:setSizeVariation( 1 )
+    particles:setRadialAcceleration( 0, 0.5 )
+    particles:setSpeed( 0.2, 1 )
+    particles:setLinearDamping( 1, 10 )
+    particles:setRelativeRotation( true )
+    particles:setEmitterLifetime( -1 )
+    particles:setParticleLifetime( 0, 15 )
+    particles:setSpread( 0.05 )
+    particles:setColors(
+      1, 1, 1, 1,
+      91 / 255, 206 / 255, 250 / 255, 1,
+      245 / 255, 169 / 255, 184 / 255, 1,
+      1,1,1,0
+
+    )
+  end
+
+
   sitelenpona = assert( require "sitelenpona" )
   text = assert( require "text" )
   marble = assert( require "marble" )
   wave = assert( require "wave" )
   DetectCollision = assert ( require "collision" )
+  audio = assert( require "audio" )
+  recorder = assert( require "recorder" )
   return state.Reset()
 
 end
 
+local function ExtrapolateBeatScore( )
+  local t = love.timer.getTime()
+  local beat = state.beat
+  if not beat.t then return 2.0 end
+  if not beat.mu then return 2.0 end
+  if beat.mu < 0.001 then return 2.0 end
+
+  t = 1.1 * math.sin( math.pi * ( t - beat.t ) / beat.mu )
+  return t * t * t * t
+end
 
 local function BeatScore( t )
   local beat = state.beat
@@ -82,63 +117,61 @@ local function BeatScore( t )
     return 2.0
   end
 
+  local score = 1.1 * math.sin( math.pi * dt / beat.mu )
+  score = score * score * score * score
+
   --General case: update average beat length.
-  local WEIGHT = 0.25 --High number makes the last beat more significant.
-  local mu = ( 1.0 - WEIGHT ) * beat.mu + WEIGHT * dt
-  beat.mu = mu
+  if dt > 0.2 then
+
+    local WEIGHT = 0.85 --High number makes the last beat more significant.
+    local mu = ( 1.0 - WEIGHT ) * beat.mu + WEIGHT * dt
+    beat.mu = mu
 
-  --Safety: avoid a dbz.
-  if mu < 0.001 or dt < 0.001 then
-    return 0.0
-    --error( "DBZ! Beat length too small." )
-  end
-
-  --Calculate beat score.
-  local score = dt * dt / ( mu * mu )
-  local TOLERANCE = 1.04
-  if dt < mu then 
-    return TOLERANCE * score
-  else
-    return TOLERANCE / score
   end
 
+  return score
 end
 
-local function OnVictory()
-
-end
-
-local function OnImpact( impact )
+OnImpact = function( impact )
   if not impact then return end
   local score = BeatScore( impact.t )
   --DEBUG
   state.lastBeatScore = score
+  local pass = false
 
-  local sound
-  if score > state.beatScoreThreshold then
-    sound = sounds.goodPing
+  if score > 1.0 then
 
-    state.beatScoreThreshold = 1.0
+    pass = true
     state.currentBeat = state.currentBeat + 1
     if state.currentBeat >= 120 then
       return OnVictory()
     end
-
-
-  else
-
-    sound = sounds.badPing
-    state.beatScoreThreshold = state.beatScoreThreshold - 0.05
-
   end
 
-  love.audio.play( sound )
-  
+
+  local x, y = math.cos(impact.th), math.sin(impact.th)
+  particles:setPosition( impact.r * x, impact.r * y )
+  particles:setEmissionArea( "normal", 0.1, 0.2, impact.th, true )
+  particles:emit( 50 * score * score )
+
+  audio.OnImpact( impact, score, pass, state.currentBeat )
   marble.OnImpact( impact )
   wave.OnImpact( impact )
 end
+local _OnImpact = OnImpact
 
 
+local function NewGame()
+  OnImpact = _OnImpact
+  state.Reset()
+  marble.Reset()
+  wave.Reset()
+end
+
+ 
+OnVictory = function()
+  OnImpact = function() end
+end
 
 function love.draw()
 
@@ -149,36 +182,42 @@ function love.draw()
   love.graphics.print( state.beatScoreThreshold, 0, 20)
   love.graphics.print( state.lastBeatScore, 0, 30 )]]
 
-
+  local score = ExtrapolateBeatScore()
 
   love.graphics.push( "transform" )
   love.graphics.applyTransform( transform )
-  wave.Draw()
-  
-  if debugRenderImpact then
-  
-  love.graphics.setLineWidth( 0.01 )
-  love.graphics.setColor( 1, 0, 0, 0.5 ) --Red: Incoming
-  love.graphics.line(
-    debugRenderImpact.xi,
-    debugRenderImpact.yi,
-    debugRenderImpact.xf,
-    debugRenderImpact.yf)
-  love.graphics.setColor( 0, 1, 0, 0.5 ) --Green: Normal
-  love.graphics.line(
-    debugRenderImpact.xi,
-    debugRenderImpact.yi,
-    debugRenderImpact.xn,
-    debugRenderImpact.yn)
-  love.graphics.setColor( 0, 0, 1, 0.5 ) -- Blue: Outgoing
+
+
+
+  wave.Draw( score )
+
+  love.graphics.setColor( 1.0, 1.0, 1.0, 1.0 )
+  love.graphics.draw(particles, 0, 0)
+
+  --[[if debugRenderImpact then
+
+    love.graphics.setLineWidth( 0.01 )
+    love.graphics.setColor( 1, 0, 0, 0.5 ) --Red: Incoming
     love.graphics.line(
-    debugRenderImpact.xi,
-    debugRenderImpact.yi,
-    debugRenderImpact.vxout,
-    debugRenderImpact.vyout)
-  
-  end
-  
+      debugRenderImpact.xi,
+      debugRenderImpact.yi,
+      debugRenderImpact.xf,
+      debugRenderImpact.yf)
+    love.graphics.setColor( 0, 1, 0, 0.5 ) --Green: Normal
+    love.graphics.line(
+      debugRenderImpact.xi,
+      debugRenderImpact.yi,
+      debugRenderImpact.xn,
+      debugRenderImpact.yn)
+    love.graphics.setColor( 0, 0, 1, 0.5 ) -- Blue: Outgoing
+    love.graphics.line(
+      debugRenderImpact.xi,
+      debugRenderImpact.yi,
+      debugRenderImpact.vxout,
+      debugRenderImpact.vyout)
+
+  end]]
+
   love.graphics.pop()
 
   sitelenpona.Draw( text.tok[state.currentBeat] )
@@ -191,19 +230,26 @@ end
 
 
 function love.update( dt )
+
+  audio.Update( ExtrapolateBeatScore() )
+  particles:update( dt )
   dt = dt + state.timeToSimulate
+
+  --Physics tick.
   while dt > step do
+    recorder.Update( marble.GetAcceleration() ) --For savegames.
+
     marble.Integrate( step )
     wave.Integrate( step )
-    
+
     OnImpact(
       DetectCollision( 
         marble.Current(), marble.Next(),
         wave.Current(), wave.Next() ))
-    
+
     marble.Update()
     wave.Update()
-    
+
     dt = dt - step
   end
   state.timeToSimulate = dt
@@ -211,7 +257,8 @@ end
 
 function love.keypressed( key, code, isRepeat )
   if key == "escape" then return love.event.quit() end
-  if key == "return" then return OnImpact{ t = love.timer.getTime() } end
+  if key == "return" then return OnVictory() end
+  if key == "space" then return NewGame() end
   return marble.OnKey()
 end
 
diff --git a/marble.lua b/marble.lua
index 06db986..595b4bf 100644
--- a/marble.lua
+++ b/marble.lua
@@ -4,14 +4,18 @@ local oldBuffer = love.graphics.newCanvas()
 local newBuffer = love.graphics.newCanvas()
 local oldState, curState, newState
 
-local FRICTION = 0.01
-local MAXSPEED = 5.0
+local FRICTION = 0.05
+local MAXSPEED = 4
 local ddx, ddy = 0.0, 0.0
 
 local function State( )
   return { t = 0, x = 0, y = 0, dx = 0, dy = 0 }
 end
 
+local function GetAcceleration( )
+  return ddx, ddy
+end
+
 local function Current() return curState end
 local function Next() return newState end
 
@@ -60,13 +64,13 @@ local function OnImpact( impact )
   inward * (- math.sin(impact.th) ) - (1.0 - inward) * ( x * s + vy * c )
   
   curState.x, curState.y = x, y
-  curState.dx, curState.dy = 0.5 * vxout, 0.5 * vyout
+  curState.dx, curState.dy = vxout, vyout
   
   debugRenderImpact = { xi = x, yi = y, xf = x - vx, yf = y - vy,
     xn = 0.2 * unx + x, yn = 0.2 * uny + y,
     vxout = x + vxout, vyout = y + vyout}
   
-  return Integrate( math.max( impact.dt , 1 / 60 ) ) --Hmm! Maybe this should be a fixed step instead for stability's sake.
+  return Integrate( math.max( impact.dt , 1 / 120 ) ) --Hmm! Maybe this should be a fixed step instead for stability's sake.
 end
 
 local function Update()
@@ -120,7 +124,7 @@ local function Draw()
   love.graphics.draw( newBuffer )
   love.graphics.setColor( 1, 1, 1, 1.0 ) --White.
   love.graphics.setLineWidth( 1.0 )
-  love.graphics.circle( "line", xn, yn, 4 )
+  --love.graphics.circle( "line", xn, yn, 4 )
   
   oldBuffer, newBuffer = newBuffer, oldBuffer
 
@@ -159,4 +163,5 @@ return {
   Resize = Resize,
   Current = Current,
   Next = Next,
+  GetAcceleration = GetAcceleration,
 }
\ No newline at end of file
diff --git a/prideflag.png b/prideflag.png
new file mode 100644
index 0000000..64f051c
Binary files /dev/null and b/prideflag.png differ
diff --git a/recorder.lua b/recorder.lua
new file mode 100644
index 0000000..2ac4364
--- /dev/null
+++ b/recorder.lua
@@ -0,0 +1,32 @@
+--Record demos.
+local love = love
+local recorder = {}
+recorder.isLoaded = false
+local i = 0
+
+local function Reset()
+  i = 0
+end
+
+function recorder.Update( ddx, ddy )
+  local byte = 0
+  if ddx > 0.5 then byte = byte + 1 end
+  if ddy > 0.5 then byte = byte + 2 end
+  if ddx < -0.5 then byte = byte + 4 end
+  if ddy < -0.5 then byte = byte + 8 end
+  
+  i = i + 1
+  recorder[i] = string.char( byte )
+end
+
+function recorder.Load( )
+  local s = love.filesystem.read( "demo" )
+  
+  recorder.isLoaded = true
+end
+
+function recorder.Save( )
+  assert( love.filesystem.write( "demo", table.concat( recorder ) ) )
+end
+
+return recorder
\ No newline at end of file
diff --git a/sounds/chime.flac b/sounds/chime.flac
new file mode 100644
index 0000000..92a5a8f
Binary files /dev/null and b/sounds/chime.flac differ
diff --git a/sounds/chime8.ogg b/sounds/chime8.ogg
index 96174b9..ecfc4d7 100644
Binary files a/sounds/chime8.ogg and b/sounds/chime8.ogg differ
diff --git a/sounds/chimeb.flac b/sounds/chimeb.flac
new file mode 100644
index 0000000..2490258
Binary files /dev/null and b/sounds/chimeb.flac differ
diff --git a/sounds/drone.flac b/sounds/drone.flac
new file mode 100644
index 0000000..2801876
Binary files /dev/null and b/sounds/drone.flac differ
diff --git a/wave.lua b/wave.lua
index d493deb..8e32c11 100644
--- a/wave.lua
+++ b/wave.lua
@@ -2,7 +2,7 @@
 local love = love
 local N = 33
 local SOUNDSPEED = 0.5
-local IMPULSESIZE = 20
+local IMPULSESIZE = 5
 local DAMPING = 0.01
 
 
@@ -20,6 +20,7 @@ local shader = love.graphics.newShader([[
   
   uniform float re[33];
   uniform float im[33];
+  uniform float score;
   
   //Slow IDFT
   float r( float x )
@@ -47,7 +48,7 @@ local shader = love.graphics.newShader([[
 
     float r = r( atan(p.y, p.x) ) - length( p );
 
-    return vec4(color.x, color.y, color.z, (r > -0.01)) ;
+    return vec4( (1.0 + float(score > 1.0) * r * 0.1) * color.xyz, float(r > -0.01)) ;
 }
   ]])
 
@@ -175,8 +176,6 @@ local function Wave( )
   local t = {
     --radii[k] = radius of point on curve at angle (k - 1) / N
     radii = {},
-    --TIME derivative of radius
-    vrad = {},
 
     --SPACE DFT of radius function (which is periodic)
     dftre = {},
@@ -184,21 +183,21 @@ local function Wave( )
   }
 
   for i = 1, N do
-    t.radii[i] = 1.0 + 0.05 * ( i/N + math.sin( i * 2.0 * math.pi / N  ))
-    t.vrad[i] = 0.0
+    t.radii[i] = 1.0
   end
   DFT( t )
 
   return setmetatable(t, mt)
 end
 
-local function Draw()
+local function Draw( score )
 
   -- Blue circle.
   love.graphics.setColor(  91 / 255, 206 / 255, 250 / 255 )
   
   shader:send( "re", unpack( cur.dftre ) )
   shader:send( "im", unpack( cur.dftim ) )
+  shader:send( "score", score )
   love.graphics.setShader( shader )
   love.graphics.circle("fill", 0, 0, 1.5)
   local t = love.timer.getTime()
@@ -253,7 +252,7 @@ local function Draw()
 end
 
 
-local function Update()
+local function Update( )
 
   --Deep copy of current state to old state.
   for name, t in pairs( cur ) do
@@ -290,6 +289,11 @@ local function DetectCollision( px, py, vpx, vpy )
 end
 
 local function Reset()
+  
+  SOUNDSPEED = 0.5
+  IMPULSESIZE = 5
+  DAMPING = 0.02
+
   old = Wave()
   cur = Wave()
   new = Wave()