diff --git a/README.md b/README.md
index d433329..ba99f05 100644
--- a/README.md
+++ b/README.md
@@ -14,9 +14,11 @@ Every locked door has a matching key, and every floor has a final door that desc
 
 While events are recorded in a breadth-based loop, playback is depth-first. At each step in the playback loop, which begins advancing when the splash screen is dismissed, all available modulation events within that loop step are played before advancing to the next step. 1:1, 1:2, 1:3, 2:1, 2:2, 3:1, and so on.
 
-Adjust the `Drone Base` note, `Loop Length`, and `Max Step Depth`, along with various `Asterion (Engine)` characteristics in the params menu. Note that in the `Asterion (Engine)` params, only `amplitude`, `hz` and `noise amplitude` will stay where you put them due to the nature of the script. Also note that `attack`, `decay`, and `release` are both unused in the script and currently unimplemented in the engine. That's a big TODO, buddy.
+Adjust the `Drone Base` note, `Loop Length`, and `Max Step Depth`, along with various `Asterion (Engine)` characteristics in the params menu. Note that in the `Asterion (Engine)` params, only `amplitude`, `hz` and `noise amplitude` will stay where you put them due to the nature of the script.
 
-Parameter adjustments are not recorded to the loop. Only events from gameplay are sequenced.
+In addition to the sequenced drone, programmed by exploring the labyrinth, you can play accent notes in scale from the drone base using your (typing) keyboard's number keys. These will play the ten notes in the `scale` of your selection from the `Asterion` parameter group. You may also adjust the fixed `velocity` of accent notes played. Note that `attack`, `decay`, `sustain` and `release` within the `Asterion (Engine)` params apply exclusively to the Accent feature in this script and have not effect on the drone.
+
+Parameter adjustments and accent notes are not recorded to the loop. Only events from gameplay are sequenced.
 
 A word of WARNING: Care has been take to tame the drone, but it has some intimidating qualities that should be explored at moderate volumes as you begin to wander the labyrinth. I moved from testing it on a regular stereo speaker to a bass amp and nearly had a heart attack.
 
diff --git a/asterion.lua b/asterion.lua
index 2bc1dab..318caff 100644
--- a/asterion.lua
+++ b/asterion.lua
@@ -66,7 +66,7 @@ function init()
   parameters = Parameters:new()
   pouch = Pouch:new()
   labyrinth:init()
-  parameters.init()
+  parameters:init()
   redraw()
 end
 
@@ -88,6 +88,11 @@ function keyboard.code(k, z)
     else
       commence()
     end
+  else
+    local note_input = tonumber(k)
+    if note_input then
+      minstrel:accent_song(note_input, parameters:get('scale'))
+    end
   end
 end
 
diff --git a/lib/engine/Engine_Asterion.sc b/lib/engine/Engine_Asterion.sc
index 6ddb6bc..0974aa0 100644
--- a/lib/engine/Engine_Asterion.sc
+++ b/lib/engine/Engine_Asterion.sc
@@ -3,17 +3,17 @@
 
 // Inherit methods from CroneEngine
 Engine_Asterion : CroneEngine {
-  var <synth, params;
+  var <drone, params, voice=0, voice_next, voice_on, voice_off, <voices;
 
   *new { arg context, doneCallback;
     ^super.new(context, doneCallback);
   }
 
   alloc {
-    // TODO Expand with trigger and env
     SynthDef(\Asterion, {
-      arg amp=0.0, attack=0.1, breadth=0.1, decay=0.1, depth=0.1, gloom=0.01, hz=65.41, noise_amp=0.5, release=0.3, shine=0.1, t_gate;
-      var band_hz, band_width, delay, delay_buffer, filtered, high, low, mid, mix, noise, noise_cutoff, verb;
+      arg amp=0.0, attack=0.1, breadth=0.1, decay=0.1, depth=0.1, gate=1, gloom=0.01, hz=65.41, noise_amp=0.5, release=0.3, shine=0.1, sustain=1;
+      var band_hz, band_width, delay, delay_buffer, env, filtered, high, low, mid, mix, noise, noise_cutoff, verb;
+      env = EnvGen.kr(Env.adsr(attack, decay, sustain, release), gate);
       delay_buffer = Buffer.alloc(context.server, 360);
       band_hz = hz - ((hz / 2) * depth);
       band_width = 3 * breadth;
@@ -26,12 +26,12 @@ Engine_Asterion : CroneEngine {
       verb = FreeVerb.ar({Mix.ar(high)}, shine, breadth, depth);
       mix = LeakDC.ar(Splay.ar([low, mid, high, noise, delay, verb]));
       filtered = BBandStop.ar(mix, band_hz, band_width);
-      Out.ar(0, Limiter.ar(filtered * amp));
+      Out.ar(0, Limiter.ar(filtered * amp * env));
     }).add;
 
     context.server.sync;
 
-    synth = Synth(\Asterion, target:context.server);
+    drone = Synth(\Asterion, target:context.server);
 
     params = Dictionary.newFrom([
       \amp: 0.5,
@@ -39,23 +39,69 @@ Engine_Asterion : CroneEngine {
       \breadth: 0.1,
       \decay: 0.1,
       \depth: 0.1,
+      \gate: 1,
       \gloom: 0.1,
       \hz: 130.813,
       \noise_amp: 0.5,
       \release: 0.3,
-      \shine: 0.5;
+      \shine: 0.5,
+      \sustain: 1;
     ]);
     
     params.keysDo({ arg key;
       this.addCommand(key, "f", { arg msg;
-        synth.set(key, msg[1])
+        drone.set(key, msg[1])
       });
     });
 
-    this.addCommand(\note, "i", { arg msg; synth.set(\hz, msg[1].midicps)});
+    // note commands select or cycle through five voices in addition to the drone,
+    // which are controlled with command arguments.
+    voices = Array.fill(5, Synth(\Asterion, [\gate, 0], target:context.server));
+
+    voice_next = ({voice = (voice+1).wrap(0, 4)});
+
+    voice_on = ({
+      arg id, note_num, velocity, attack, decay, sustain, release;
+      var hz=if(note_num.notNil, {note_num.midicps}, {params[\hz]});
+      var amp=if(velocity.notNil, {1/127 * velocity}, {params[\amp]});
+
+      id=if(id.notNil, {id}, {var v = voice; voice_next.(); v});
+      attack=if(attack.notNil, {attack}, {params[\attack]});
+      decay=if(decay.notNil, {decay}, {params[\decay]});
+      sustain=if(sustain.notNil, {sustain}, {params[\sustain]});
+      release=if(release.notNil, {release}, {params[\release]});
+
+      voice_off.(id);
+      voices[id].set(\amp, amp, \hz, hz, \attack, attack, \decay, decay, \sustain, sustain, \release, release, \gate, 1)
+    });
+
+    voice_off = ({|i| voices[i].set(\gate, 0)});
+
+    this.addCommand(\note, "i", { arg msg; drone.set(\hz, msg[1].midicps)});
+
+    this.addCommand(\note_on, "iiiffff", {
+      // id, note_num, velocity, attack, decay, sustain, release
+      arg msg;
+      voice_on.(msg[1], msg[2], msg[3], msg[4], msg[5], msg[6], msg[7]);
+    });
+
+    this.addCommand(\note_off, "i", {arg msg;
+      voice_off.(msg[1])
+    });
+
+    // One-shot with duration argument
+    this.addCommand(\play_note, "iifffff", {
+      // note_num, velocity, duration, attack, decay, sustain, release
+      arg msg;
+      var v = voice;
+      voice_next.();
+      voice_on.(v, msg[1], msg[2], msg[4], msg[5], msg[6], msg[7]);
+      SystemClock.sched(msg[3], {voice_off.(v); nil});
+    });
   }
 
   free {
-    synth.free;
+    voices.do({arg synth; synth.free});
+    drone.free;
   }
 }
\ No newline at end of file
diff --git a/lib/engine/asterion_engine.lua b/lib/engine/asterion_engine.lua
index 67f86d0..59e9dd0 100644
--- a/lib/engine/asterion_engine.lua
+++ b/lib/engine/asterion_engine.lua
@@ -14,13 +14,15 @@ local parameters = {
   {id = 'depth', name = 'depth', type = 'control', min = 0.01, max = 1, default = 0.1, formatter = function(param) return quantize_and_format(param:get()*100, 0.1, '%') end},
   {id = 'gloom', name = 'gloom', type = 'control', min = 0.01, max = 1, default = 0.1, formatter = function(param) return quantize_and_format(param:get()*100, 0.1, '%') end},
   {id = 'shine', name = 'shine', type = 'control', min = 0.01, max = 1, default = 0.5, formatter = function(param) return quantize_and_format(param:get()*100, 0.1, '%') end},
+  {id = 'gate', name = 'drone gate', type = 'number', min = 0, max = 1, default = 1, formatter = function(param) return (param:get() == 1 and 'open' or 'closed') end},
   {id = 'attack', name = 'attack', type = 'control', min = 0.001, max = 17, warp = 'exp', default = 0.01, formatter = function(param) return quantize_and_format(param:get(), 0.01, ' s') end},
   {id = 'decay', name = 'decay', type = 'control', min = 0.001, max = 17, warp = 'exp', default = 0.1, formatter = function(param) return quantize_and_format(param:get(), 0.01, ' s') end},
-  {id = 'release', name = 'release', type = 'control', min = 0.001, max = 17, warp = 'exp', default = 0.3, formatter = function(param) return quantize_and_format(param:get(), 0.01, ' s') end}
+  {id = 'sustain', name = 'sustain', type = 'control', min = 0.01, max = 1, default = 1, formatter = function(param) return quantize_and_format(param:get()*100, 0.1, '%') end},
+  {id = 'release', name = 'release', type = 'control', min = 0.001, max = 17, warp = 'exp', default = 0.3, formatter = function(param) return quantize_and_format(param:get(), 0.01, ' s') end},
 }
 
 function Asterion:add_params()
-  params:add_group('asterion_engine', 'ASTERION (ENGINE)', 10)
+  params:add_group('asterion_drone', 'ASTERION (Engine)', 12)
   for i = 1, #parameters do
     local parameter = parameters[i]
     if parameter.type == 'control' then
diff --git a/lib/minstrel.lua b/lib/minstrel.lua
index f5a79d2..51e9434 100644
--- a/lib/minstrel.lua
+++ b/lib/minstrel.lua
@@ -1,4 +1,5 @@
 local Song = include('lib/minstrel/song')
+local music_util = require('musicutil')
 
 local Minstrel = {
   clock = nil,
@@ -26,6 +27,19 @@ function Minstrel:init()
   self.clock:start()
 end
 
+function Minstrel:accent_song(i, scale)
+  if i == 0 then i = 10 end
+  engine.play_note(
+    scale[i],
+    params:get('velocity'),
+    self:_get_time(),
+    params:get('attack'),
+    params:get('decay'),
+    params:get('sustain'),
+    params:get('release')
+  )
+end
+
 function Minstrel:adjust_song()
   self.song:adjust()
 end
@@ -52,7 +66,7 @@ function Minstrel:_check_time()
 end
 
 function Minstrel:_get_time()
-  return 60 / self.tempo
+  return 60 / (self.tempo or params:get('clock_tempo'))
 end
 
 return Minstrel
\ No newline at end of file
diff --git a/lib/parameters.lua b/lib/parameters.lua
index 7aece76..93a098c 100644
--- a/lib/parameters.lua
+++ b/lib/parameters.lua
@@ -1,7 +1,13 @@
 local music_util = require('musicutil')
 local asterion_engine = include('/lib/engine/asterion_engine')
 
-local Parameters = {}
+local SCALE_LENGTH = 10
+
+local Parameters = {
+  scale = nil,
+  scale_type = nil,
+  scale_types = nil
+}
 
 function Parameters:new(options)
   local instance = options or {}
@@ -10,18 +16,42 @@ function Parameters:new(options)
   return instance
 end
 
-function Parameters.init()
-  params:add_group('asterion', 'ASTERION', 3)
+function Parameters:init()
+  self:_set_musicutil_scale_types()
+  params:add_group('asterion', 'ASTERION', 6)
   params:add_number('base', 'Drone Base', 0, 127, 36, function(param) return music_util.note_num_to_name(param:get(), true) end)
-  params:set_action('base', function(n) params:set('hz', music_util.note_num_to_freq(n)) end)
+  params:set_action('base', function(n) params:set('hz', music_util.note_num_to_freq(n)); self:_generate_scale() end)
   params:add_number('loop_length', 'Loop Length', 8, 2048, 16)
   params:add_number('step_depth', 'Max Step Depth', 1, 256, 4)
+  params:add_separator('accent', 'ACCENTS')
+  params:add_option('scale_type', 'Scale', self.scale_types, 1)
+  params:set_action('scale_type', function(i) self.scale_type = self.scale_types[i]; self:_generate_scale() end)
+  params:add_number('velocity', 'Velocity', 0, 127, 100)
   asterion_engine:add_params()
 end
 
+function Parameters:get(k)
+  return self[k]
+end
+
 function Parameters.set_song_update(update_song_params)
   params:set_action('loop_length', update_song_params)
   params:set_action('step_depth', update_song_params)
 end
 
+function Parameters:_generate_scale()
+  local note = music_util.freq_to_note_num(params:get('hz'))
+  self.scale = music_util.generate_scale_of_length(note, self.scale_type, SCALE_LENGTH)
+end
+
+function Parameters:_set_musicutil_scale_types()
+  local scales = {}
+  for i = 1, #music_util.SCALES do
+    scales[i] = music_util.SCALES[i].name
+  end
+
+  self.scale_types = scales
+end
+
+
 return Parameters
\ No newline at end of file