diff --git a/moonwalk.py b/moonwalk.py
index 94cbca2..17f0722 100644
--- a/moonwalk.py
+++ b/moonwalk.py
@@ -18,8 +18,11 @@ import numpy as np
 # from deep_sort_realtime.deepsort_tracker import DeepSort
 from sort import Sort
 from collections import defaultdict
+from collections.abc import Callable
 import math
-
+import easing_functions
+from easing_functions.easing import EasingBase
+from functools import partial
 
 
 Interval = float # seconds
@@ -39,7 +42,11 @@ colorset = [(255, 0, 0),
 VELOCITY_FACTOR = 30*.05 # a pixels/second velocity of 400 gives a frame-duration of .05
 
 images_nrs = range(125, 162)
-angles = [0,15,30,45]
+angles = list(range(0,360,15))
+# angles.pop(angles.index(60))
+# angles.pop(angles.index(75))
+# angles.pop(angles.index(90))
+
 
 walk_animations = {}
 for a in angles:
@@ -50,6 +57,7 @@ for a in angles:
         pic: pyglet.image.ImageData = pyglet.image.load(fn)
         walk_images.append(pic)
     walk_animations[a] = pyglet.image.animation.Animation.from_image_sequence(walk_images, 1, True)
+    logger.info("Loaded animation for {a} degree")
 
 walk_animation = walk_animations[0]
 
@@ -62,52 +70,141 @@ walk_animation_dim = {
     'x': walk_animation.get_max_width()
 }
 
+class PotmeterShape():
+    value = 0
 
-@dataclass
-class Params:
-    visual_variability: float = 0
-    # video_fps: float = 60
-    tracker_fps: float = 5.6
-    # iou = None
-    emitter_speed: float = 1.2 # objects per second
-    object_velocity: float = 100 # pixels/second
-    velocity_decay: float = 1 # make system a bit springy
-    iou_threshold: float = 0 # SORT Intersection over union
-    movement_angle: float = 0 # angle at which the blobs move (-45 - +45 degrees)
+    def __init__(self, cx, cy, r, canvas: Canvas, input: Input, batch: Optional[pyglet.graphics.Batch] = None):
+        #   A rendered potmeter
+        self.input = input
+        self.canvas = canvas
+        self.batch=batch
+        self.cx = cx
+        self.cy = cy
+        self.r = r
 
-    def add_listener(self, attr: str, callback: callable):
+        x, y = self.get_xy_for_t(input.t)
+        self.shapes = (
+            pyglet.shapes.Arc(cx,cy,30, batch= batch), # potmeter
+            pyglet.shapes.Line(cx,cy,x,y, width=2, batch= batch) # potmeter position
+        )
+        # TODO: mouse scroll
+        # TODO: listen for actual values
+        self.input.add_listener(self.rotate)
+
+    def rotate(self, value, old_value, t, old_t):
+        x, y = self.get_xy_for_t(t)
+        self.shapes[1].x2 = x
+        self.shapes[1].y2 = y
+        # self.shapes[1].x2
+        # self.shapes[1].y2
+        pass
+        #   self.shapes.line......
+    
+    def get_xy_for_t(self, t):
+        return (
+            self.cx + self.r * math.sin(t * math.pi * 2),
+            self.cy + self.r * math.cos(t * math.pi * 2)
+        )
+
+    def on_mouse_scroll(self, x, y, scroll_x, scroll_y):
+        # determine xy position to select var to change,
+        # then change according to scroll_y
+        if x >= self.cx - self.r and \
+                x <= self.cx + self.r and \
+                y >= self.cy - self.r and \
+                y <= self.cy + self.r:
+                    self.input.t += scroll_y / 100
+
+
+class Input():
+    """
+    maps linear input (t) to params value
+    """
+    def __init__(self, default_t: float = 0, mapping: EasingBase = easing_functions.LinearInOut(start=0, end=100)):
+        # listereners are callables which have 2 float params and return nothing:
+        self._listeners: list[Callable[[float,float, float, float], None]] = []
+        self.mapping = mapping
+        
+        self._t = None
+        self._v = None
+
+        self.t = default_t
+        # pyglet.text.Label(100,100,30) #name
+        # pyglet.text.Label(100,100,30) # current value  
+        
+
+    @property
+    def t(self):
+        return self._t
+
+    @t.setter
+    def t(self, t: float):
+        """
+        Set the underlying linear value
+        """
+        # 0 <= v <= 1024
+        old_t = self._t
+        old_v = self._v
+        
+        t = min(1, max(0, t))
+
+
+        if not old_t or abs(old_t - t) > 0.002: # resolution of 500, to mitigate analog potmeter noise
+            self._t = t
+            self._v = self.mapping(self._t)
+            for listener in self._listeners:
+                listener(self.value, old_v, self._t, old_t)
+        
+    @property
+    def value(self) -> float:
+        """
+        Get value converted from self.v
+        """
+        return self.mapping(self._t)
+
+    def add_listener(self, callback: Callable[[float, float, float, float], None]):
         """
         Add a listener for a change, callback gets
-        called with (attribute_name, old_value, new_value)
+        called with (old_value, new_value)
         """
-        if not attr in self.get_listeners():
-            self._listeners[attr] = []
-        self._listeners[attr].append(callback)
+        self._listeners.append(callback)
     
-    def get_listeners(self) -> dict[str, callable]:
-        if not hasattr(self, "_listeners"):
-            self._listeners = {}
+    def get_listeners(self) -> list[Callable[[float, float, float, float], None]]:
         return self._listeners
 
-    def __setattr__(self, attr, val):
-        if attr == '_listeners':
-            super().__setattr__(attr, val)
-            return
-    
-        if attr == 'tracker_fps' and val < .1:
-            # limit tracker fps
-            val = .1
-    
-        if attr == 'emitter_speed' and val < .1:
-            # limit tracker fps
-            val = .1
-        
-        old_val = getattr(self, attr)
-        super().__setattr__(attr, val)
-        if attr in self.get_listeners():
-            for listener in self._listeners[attr]:
-                listener(attr, old_val, val)
+class SteppedEasing(EasingBase):
+    def __init__(self, steps: list):
+        self.steps = steps
+        pass
 
+    def ease(self, alpha):
+        i = math.ceil(max(1e-100, alpha) * len(self.steps)) - 1
+        return self.steps[i]
+
+class Params:
+    def __init__(self):
+        self.visual_variability = Input(0, easing_functions.LinearInOut(start=0, end=100))
+        # video_fps = Input(60
+        self.tracker_fps = Input(.3, easing_functions.QuadEaseIn(start=.1, end=60))
+        # iou = None
+        self.emitter_speed = Input(.2, easing_functions.LinearInOut(start=0, end=7)) # objects per second
+        self.object_velocity = Input(.4, easing_functions.LinearInOut(start=0, end=500)) # pixels/second TODO: allow negative
+        # velocity_decay = Input(1, easing_functions.LinearInOut(start=0, end=100)) # make system a bit springy
+        self.iou_threshold = Input(0, easing_functions.LinearInOut(start=0, end=1)) # SORT Intersection over union
+        self.movement_angle = Input(0, SteppedEasing(angles)) # angle at which the blobs move (-45 - +45 degrees)
+
+    def keys(self) -> list[str]:
+        return list(filter(lambda a: not a.startswith('__') and a not in ['keys', 'items', 'values'], dir(self)))
+    
+    def items(self) -> list[tuple[str, Input]]:
+        return [
+            (k, getattr(self, k)) for k in self.keys()
+        ]
+    
+    def values(self) -> list[Input]:
+        return [
+            getattr(self, k) for k in self.keys()
+        ]
 
 
         
@@ -119,13 +216,12 @@ class DetectedObject:
         self.w = 160 # width
         self.h = 320 # height
         self.l = -self.w # left
-        self.t = (self.canvas.height - self.h)/2 - math.sin(self.canvas.params.movement_angle/360*math.pi*2) * self.canvas.width/2 # top
+        self.t = (self.canvas.height - self.h)/2 - math.sin(self.canvas.params.movement_angle.value/360*math.pi*2) * self.canvas.width/2 # top
 
         # self.shape = pyglet.shapes.Rectangle(self.l, self.t, self.w, self.h, color=(255, 22, 20), batch=self.canvas.batch_figures)
 
-        angle = min(angles, key=lambda x:abs(x-self.canvas.params.movement_angle))
         
-        self.shape = pyglet.sprite.Sprite(img=walk_animations[angle],x=self.l, y=self.t, batch=self.canvas.batch_figures)
+        self.shape = pyglet.sprite.Sprite(img=walk_animations[self.canvas.angle],x=self.l, y=self.t, batch=self.canvas.batch_figures)
         self.shape.scale_x = self.w/walk_animation_dim['x']
         self.shape.scale_y = self.h/walk_animation_dim['y']
         # rectangle.opacity = 128
@@ -136,8 +232,8 @@ class DetectedObject:
         """
         Update position
         """
-        self.l += dt * self.canvas.params.object_velocity * math.cos(self.canvas.params.movement_angle/360*2 * math.pi) 
-        self.t += dt * self.canvas.params.object_velocity * math.sin(self.canvas.params.movement_angle/360*2 * math.pi)
+        self.l += dt * self.canvas.params.object_velocity.value * math.cos(self.canvas.params.movement_angle.value/360*2 * math.pi) 
+        self.t += dt * self.canvas.params.object_velocity.value * math.sin(self.canvas.params.movement_angle.value/360*2 * math.pi)
         self.shape.x = self.l
         self.shape.y = self.t
         # TODO exponential decay with self.params.velocity_decay
@@ -153,7 +249,10 @@ class ObjectEmitter:
 
     def emit(self, dt: Interval) -> list[DetectedObject]:
         self.lastEmit += dt
-        if self.lastEmit is None or self.lastEmit >= 1/self.params.emitter_speed:
+        if self.params.emitter_speed.value == 0:
+            return []
+        
+        if self.lastEmit is None or self.lastEmit >= 1/self.params.emitter_speed.value:
             logger.info('emit!')
             obj = DetectedObject(self.canvas)
             self.lastEmit = 0
@@ -165,7 +264,7 @@ class MissingDict[T](dict):
     collections.defaultdict does not accept arguments, but this is what we want/need.
     This implementation should do the trick
     """
-    def __init__(self, factory: callable, values={}):
+    def __init__(self, factory: Callable, values={}):
         self.update(values)
         self.factory = factory
 
@@ -221,23 +320,35 @@ class Canvas:
             'objects': pyglet.text.Label("", x=20, y=30, color=(255,255,255,255), batch=self.batch_info),
             'tracks': pyglet.text.Label("", x=120, y=30, color=(255,255,255,255), batch=self.batch_info),
         }
-        for i, field in enumerate(dataclasses.fields(self.params)):
-            self.labels[field.name] = pyglet.text.Label(f"{field.name}: {field.default}", x=20, y=30 + 20*(i+1), color=(255,255,255,255), batch=self.batch_info)
+
+        print('ok', self.params)
+        self.potmeters: list[PotmeterShape] = []
+        for i, item in enumerate(self.params.values()):
+            self.potmeters.append(
+                PotmeterShape(300+80*i, 130, 30, self, item, self.batch_info)
+            )
+
+        for i, param in enumerate(self.params.items()):
+            name = param[0]
+            value = param[1]
+            print(name, value)
+            self.labels[name] = pyglet.text.Label(f"{name}: {value.value}", x=20, y=30 + 20*(i+1), color=(255,255,255,255), batch=self.batch_info)
         
         # TODO: Add a number next to the box using pyglet.graphics.Group()
         self.track_shapes: MissingDict[np.float64, tuple[pyglet.shapes.Box, pyglet.text.Label]] = MissingDict(self.getTrackBboxShapes)
 
         self.tracker = Sort(max_age=5, min_hits=1, iou_threshold=0) #DeepSort(max_age=5)
 
-        pyglet.clock.schedule_interval(self.on_track, 1/self.params.tracker_fps)
+        pyglet.clock.schedule_interval(self.on_track, 1/self.params.tracker_fps.value)
 
         self.interval_items: list[pyglet.clock._ScheduledIntervalItem] = [i for i in pyglet.clock._default._schedule_interval_items if i.func == self.on_track]
-        self.params.add_listener('tracker_fps', self.on_tracker_fps_change)
-        self.params.add_listener('iou_threshold', self.on_iou_threshold_change)
-        self.params.add_listener('object_velocity', self.on_object_velocity_change)
-        self.params.add_listener('movement_angle', self.on_movement_angle_change)
+        self.params.tracker_fps.add_listener(self.on_tracker_fps_change)
+        self.params.iou_threshold.add_listener(self.on_iou_threshold_change)
+        self.params.object_velocity.add_listener(self.on_object_velocity_change)
+        self.params.movement_angle.add_listener(self.on_movement_angle_change)
+        self.on_movement_angle_change(self.params.movement_angle.value, None, None, None) # set self.angle
         # trigger first time around
-        self.on_object_velocity_change('object_velocity', None, self.params.object_velocity)
+        self.on_object_velocity_change(self.params.object_velocity.value, None, None, None)
     
     def getTrackBboxShapes(self, track_id) -> tuple[pyglet.shapes.Box, pyglet.text.Label]:
         color = colorset[int(track_id) % len(colorset)]
@@ -248,20 +359,21 @@ class Canvas:
         )
         
             
-    def on_tracker_fps_change(self, field, old_value, new_value):
+    def on_tracker_fps_change(self, value, old_value, t, old_t):
         """
         Param dataclass listener for changes to tracker_fps
         """
         for ii in self.interval_items:
-            ii.interval = 1/new_value
+            ii.interval = 1/value
             logger.debug(f"Set tracker interval to {ii.interval}")
     
-    def on_object_velocity_change(self, field, old_value, new_value):
+    def on_object_velocity_change(self, value, old_value, t, old_t):
         """
         Param dataclass listener for changes to object_velocity as to change walk animation
         """
-        duration = max(.001, VELOCITY_FACTOR / new_value)
-        logger.debug(f"set frame duration to {duration=} (for {new_value} p/s, factor: {VELOCITY_FACTOR})")
+        # TODO: when walking backwards, animation should reverse
+        duration = max(.001, VELOCITY_FACTOR / max(.1, value))
+        logger.debug(f"set frame duration to {duration=} (for {value} p/s, factor: {VELOCITY_FACTOR})")
         for anim in walk_animations.values():
             for frame in anim.frames:
                     # a velocity of 
@@ -271,11 +383,11 @@ class Canvas:
         #     ii.interval = 1/new_value
             # logger.debug(f"Set tracker interval to {ii.interval}")
     
-    def on_movement_angle_change(self, field, old_value, new_value):
+    def on_movement_angle_change(self, value, old_value, t, old_t):
         """
         Param dataclass listener for changes to movement-angle
         """
-        angle = min(angles, key=lambda x:abs(x-new_value))
+        angle = min(angles, key=lambda x:abs(x-value))
 
         if hasattr(self, 'angle') and self.angle == angle:
             return
@@ -283,15 +395,15 @@ class Canvas:
         self.angle = angle
 
         for obj in self.objects:
-            idx = obj.shape._frame_index
+            idx = obj.shape._frame_index # setting the .image property removes the frame offset, this causes the animations to sync. Because all animations have the same nr of frames, we can get and re-set this offset
             obj.shape.image = walk_animations[self.angle]
             obj.shape._frame_index = idx
     
-    def on_iou_threshold_change(self, field, old_value, new_value):
+    def on_iou_threshold_change(self, value, old_value, t, old_t):
         """
         Param dataclass listener for changes to iou_threshold
         """
-        self.tracker.iou_threshold = new_value
+        self.tracker.iou_threshold = value
 
     def run(self):
 
@@ -327,32 +439,12 @@ class Canvas:
         if symbol == pyglet.window.key.S:
             self.draw_stats = not self.draw_stats
             logger.info(f"rendering stats: {self.draw_stats}")
-        if symbol == pyglet.window.key.UP:
-            logger.debug('up')
-            self.params.object_velocity += (10 if pyglet.window.key.MOD_SHIFT & modifiers else 1)
-        if symbol == pyglet.window.key.DOWN:
-            logger.debug('down')
-            self.params.object_velocity -= (10 if pyglet.window.key.MOD_SHIFT & modifiers else 1)
 
     def on_mouse_scroll(self, x, y, scroll_x, scroll_y):
         # determine xy position to select var to change,
         # then change according to scroll_y
-        for param_name, param_value in dataclasses.asdict(self.params).items():
-            if x >= self.labels[param_name].x and \
-                x <= (self.labels[param_name].x + self.labels[param_name].content_width) and \
-                y >= self.labels[param_name].y and \
-                y <= (self.labels[param_name].y + self.labels[param_name].content_height):
-                    if param_value == 0:
-                        if scroll_y < 1:
-                            param_value -= .1
-                        else:
-                            param_value += .1
-
-                    if scroll_y < 0:
-                        param_value /= (-scroll_y * 1.25)
-                    else:
-                        param_value *= (scroll_y * 1.25)
-                    setattr(self.params, param_name, param_value)
+        for potmeter in self.potmeters:
+            potmeter.on_mouse_scroll(x, y, scroll_x, scroll_y)
 
 
     def on_track(self, dt):
@@ -376,16 +468,17 @@ class Canvas:
         # print([t[4] for t in self.tracks])
 
     
-    def set_tracker_fps(self, fps: float):
-        self.params.tracker_fps = fps
-        for interval in self.interval_items:
-            interval.interval = 1/fps
+    # def set_tracker_fps(self, fps: float):
+    #     self.params.tracker_fps.value = fps
+    #     for interval in self.interval_items:
+    #         interval.interval = 1/fps
 
 
     def prune(self):
         """
         Loop over objects remove those out of the frame
         """
+        # TODO now that there is rotation, this check needs to be a bit more elaborated
         for i, object in enumerate(self.objects.copy()):
             if object.l > self.width:
                 logging.info(f'Delete {i}')
@@ -422,10 +515,9 @@ class Canvas:
         # self.labels['velocity'].text = f"Velocity: {self.params.object_velocity}"
         # self.labels['tracker_fps'].text = f"Tracker FPS: {self.params.tracker_fps}"
 
-        for name, value in dataclasses.asdict(self.params).items():
-            self.labels[name].text = f"{name}: {value}"
+        for name, item in self.params.items():
+            self.labels[name].text = f"{name}: {item.value:.3f}"
 
-        # BIG impact 
         for track in self.tracks:
             nr = track[4]
             box: pyglet.shape.Box = self.track_shapes[nr][0]
diff --git a/poetry.lock b/poetry.lock
index ca8b007..27e3de2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -115,6 +115,17 @@ numpy = "*"
 opencv-python = "*"
 scipy = "*"
 
+[[package]]
+name = "easing-functions"
+version = "1.0.4"
+description = "A collection of the basic easing functions for python"
+optional = false
+python-versions = "*"
+files = [
+    {file = "easing_functions-1.0.4-py3-none-any.whl", hash = "sha256:27f2ce64adecde3d2d90d503ad564fc944e8f20221ba2eacf96be37c28c7ae4b"},
+    {file = "easing_functions-1.0.4.tar.gz", hash = "sha256:e18c7931d445b85f28c4d15ad0a9a47bb65d4e2eefc0db3840448fae25e3f9de"},
+]
+
 [[package]]
 name = "filterpy"
 version = "1.4.5"
@@ -667,6 +678,20 @@ files = [
 [package.extras]
 diagrams = ["jinja2", "railroad-diagrams"]
 
+[[package]]
+name = "pyserial"
+version = "3.5"
+description = "Python Serial Port Extension"
+optional = false
+python-versions = "*"
+files = [
+    {file = "pyserial-3.5-py2.py3-none-any.whl", hash = "sha256:c4451db6ba391ca6ca299fb3ec7bae67a5c55dde170964c7a14ceefec02f2cf0"},
+    {file = "pyserial-3.5.tar.gz", hash = "sha256:3c77e014170dfffbd816e6ffc205e9842efb10be9f58ec16d3e8675b4925cddb"},
+]
+
+[package.extras]
+cp2110 = ["hidapi"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.9.0.post0"
@@ -783,4 +808,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "5bc6618b484c0a855360421a70fb7e3621e1aae77d2cc39eec8a6cf240e104cb"
+content-hash = "7d635745a85a7a118b0a5d87d3f6459e8fc42faa1f5b917d9b79f157040a82ce"
diff --git a/pyproject.toml b/pyproject.toml
index f8050be..fc3d1e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,8 @@ pyglet = "^2.0.17"
 numpy = "^2.1.1"
 #lapx = "^0.5.10.post1"
 simple-online-realtime-tracking = { path = "../sort/", develop = true }
+pyserial = "^3.5"
+easing-functions = "^1.0.4"
 
 [tool.poetry.group.dev.dependencies]
 setuptools = "^75.1.0"
diff --git a/walk-animation/walking-body.blend b/walk-animation/walking-body.blend
index f92776c..7173ee2 100644
--- a/walk-animation/walking-body.blend
+++ b/walk-animation/walking-body.blend
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:9658215bbebfec3044eb8eb9fa428ec15244cc94a1a18d697f34f00e7510ce90
-size 70663196
+oid sha256:ed280620ea9e9a5f94a9fbdc0442052b69a6baec5c42107414b513a876efc92c
+size 70766516
diff --git a/walk_bw.jpg b/walk_bw.jpg
deleted file mode 100644
index 23446cb..0000000
Binary files a/walk_bw.jpg and /dev/null differ