diff --git a/atmorepl.py b/atmorepl.py
index a14d117..5d8f2f4 100644
--- a/atmorepl.py
+++ b/atmorepl.py
@@ -7,7 +7,9 @@ class WrongArgumentCount(Exception):
     def __init__(self, command, expected, found):
         if isinstance(expected, list):
             expected = "{} to {}".format(**expected)
-        msg = "Command {} expects {} arguments, found {}".format(command, expected, found)
+        msg = "Command {} expects {} arguments, found {}".format(
+            command, expected, found
+        )
         super(WrongArgumentCount, self).__init__(msg)
 
 
@@ -26,7 +28,7 @@ class AtmoClientHandler(socketserver.StreamRequestHandler):
     def handle(self):
         try:
             while not self.quit:
-                self.send(">>> ", end='')
+                self.send(">>> ", end="")
                 data = self.rfile.readline().decode().strip()
                 tokens = data.split()
                 if len(tokens) > 0:
@@ -42,10 +44,19 @@ class AtmoClientHandler(socketserver.StreamRequestHandler):
                 self._ensure_args(cmd, 0, args)
                 self.atmo.load_sounds()
                 self.send("Sounds reloaded")
+            elif cmd == "status":
+                self._ensure_args(cmd, 0, args)
+                self.send("Currently playing:")
+                s = self.atmo.get_status()
+                for line in s.splitlines():
+                    self.send(line)
+            elif cmd == "pause":
+                self._ensure_args(cmd, 0, args)
+                is_paused = self.atmo.pause()
+                self.send("Paused" if is_paused else "Resume")
             elif cmd == "help":
                 self._ensure_args(cmd, 0, args)
-                self.send("The following commands are available: ")
-                self.send("    reload")
+                self.send_usage()
             elif cmd == "exit":
                 self.quit = True
                 self.send("Bye")
@@ -53,11 +64,16 @@ class AtmoClientHandler(socketserver.StreamRequestHandler):
                 raise CommandNotFound(cmd)
         except CommandNotFound as e:
             self.send("Error: {}".format(e))
-            self.send("The following commands are available: ")
-            self.send("    reload")
+            self.send_usage()
         except WrongArgumentCount as e:
             self.send("Error: {}".format(e))
 
+    def send_usage(self):
+        self.send("The following commands are available: ")
+        self.send("    reload")
+        self.send("    status")
+        self.send("    pause")
+
     @staticmethod
     def _ensure_args(cmd, expected, args):
         if isinstance(expected, list):
@@ -67,7 +83,7 @@ class AtmoClientHandler(socketserver.StreamRequestHandler):
             if len(args) != expected:
                 raise WrongArgumentCount(cmd, expected, len(args))
 
-    def send(self, line, end='\n'):
+    def send(self, line, end="\n"):
         self.wfile.write("{}{}".format(line, end).encode())
 
 
@@ -77,7 +93,7 @@ class ReusableThreadingTCPServer(socketserver.ThreadingTCPServer):
 
 
 class AtmoReplRunner(threading.Thread):
-    def __init__(self, atmo, host='0.0.0.0', port=7723):
+    def __init__(self, atmo, host="0.0.0.0", port=7723):
         super(AtmoReplRunner, self).__init__()
         AtmoClientHandler.atmo = atmo
         self._client = ReusableThreadingTCPServer((host, port), AtmoClientHandler)
diff --git a/campatmo.py b/campatmo.py
index 66ee46f..5e2c619 100755
--- a/campatmo.py
+++ b/campatmo.py
@@ -1,92 +1,65 @@
 #!/usr/bin/env python3
-import time
-import sys
-import random
 from glob import glob
+import os
+import random
+import sys
 from threading import Thread
+import time
 from typing import Union, List, Mapping
+
+os.environ["PYGAME_HIDE_SUPPORT_PROMPT"] = "hide"
 from pygame import mixer
 
+from collection import SampleCollection
 from atmorepl import AtmoReplRunner
 
 VERBOSITY = 0
 
-
-class SoundCollection:
-    def __init__(
-        self, name, files: Union[List[str], Mapping[str, List[str]]], volume=0.5
-    ):
-        self.name = name
-        self.topics = files.keys() if hasattr(files, "keys") else []
-        if self.topics:
-            self.files = files
-        else:
-            self.files = {"None": files}
-        self.flat_files = [f for topic in self.files for f in self.files[topic]]
-        self.volume = volume
-        self.cur_topic = None
-        self.load_all_files()
-        self.sound_indices = {name: 0 for name in self.sounds}
-        self.flat_sound_index = 0
-
-    def load_all_files(self):
-        self.sounds = {}
-        if self.topics:
-            for t in self.topics:
-                self.load_topic_files(t)
-        else:
-            self.load_topic_files("None")
-        self.flat_sounds = [s for topic in self.sounds for s in self.sounds[topic]]
-        random.shuffle(self.flat_sounds)
-
-    def load_topic_files(self, topic):
-        self.sounds[topic] = []
-        for f in self.files[topic]:
-            sound = mixer.Sound(f)
-            sound.set_volume(self.volume)
-            self.sounds[topic].append(sound)
-        random.shuffle(self.sounds[topic])
-
-    def next(self):
-        if self.cur_topic is None:
-            if len(self.flat_sounds) == 0:
-                return
-            self.flat_sound_index += 1
-            if self.flat_sound_index >= len(self.flat_sounds):
-                random.shuffle(self.flat_sounds)
-                self.flat_sound_index = 0
-            return self.flat_sounds[self.flat_sound_index]
-        else:
-            if len(self.sounds[self.cur_topic]) == 0:
-                return
-            self.sound_indices[self.cur_topic] += 1
-            if self.sound_indices[self.cur_topic] >= len(self.sounds[self.cur_topic]):
-                random.shuffle(self.sounds[self.cur_topic])
-                self.sound_indices[self.cur_topic] = 0
-            return self.sounds[self.cur_topic][self.sound_indices[self.cur_topic]]
-
-    def set_topic(self, topic=None):
-        if self.topics:
-            self.cur_topic = topic
-
-    def __len__(self):
-        if self.cur_topic is None:
-            return len(self.flat_sounds)
-        else:
-            return len(self.sounds[self.cur_topic])
+channel_index = 0
 
 
 class CampAtmo:
     tracks_per_type = 2
-    single_track_types = ["lines"]
+    single_track_types = ["lines", "reactions"]
     background_track_types = ["background", "buzzwords"]
+    type_mix = {
+        "lines": 0.8,
+        "reactions": 0.7,
+        "buzzwords": 0.6,
+        "background": 0.3,
+        "other": 0.5,
+    }
     lines_delta_sec = (5, 15)
     line_reaction_wait_sec = 0.8
 
     def __init__(self):
         self.stopped = False
         mixer.init(frequency=22050 * 2)
-        self.load_sounds()
+        type_dirs = glob("samples/*/")
+        self.types = {}
+        for type_dir in type_dirs:
+            type_name = type_dir.split("/")[1]
+            self.types[type_name] = SampleCollection(
+                type_dir, volume=self.type_mix[type_name]
+            )
+        i = 0
+        mixer.set_num_channels(
+            sum(
+                [
+                    1 if name in self.single_track_types else self.tracks_per_type
+                    for name in self.types
+                ]
+            )
+        )
+        v(f"{mixer.get_num_channels()} channels set")
+        self.type_channels = {}
+        for type_name in self.types:
+            self.type_channels[type_name] = []
+            for k in range(
+                1 if type_name in self.single_track_types else self.tracks_per_type
+            ):
+                self.type_channels[type_name].append(mixer.Channel(i))
+                i += 1
 
     def start(self):
         self.background_thread = Thread(
@@ -104,80 +77,70 @@ class CampAtmo:
         self.lines_thread.join(2)
 
     def load_sounds(self):
-        type_names = glob("samples/*/")
-        type_files = {}
-        for type_dir in type_names:
-            type_name = type_dir.split("/")[1]
-            flat_files = glob(type_dir + "/*.ogg")
-            type_files[type_name] = flat_files
-            topic_files = glob(type_dir + "/*/*.ogg")
-            if topic_files:
-                type_files[type_name] = {}
-                for topic_dir in glob(type_dir + "/*/"):
-                    topic_name = topic_dir.split("/")[2]
-                    type_files[type_name][topic_name] = glob(type_dir + "/*/*.ogg")
-        self.types = {}
-        i = 0
-        mixer.set_num_channels(
-            sum(
-                [
-                    1 if name in self.single_track_types else self.tracks_per_type
-                    for name in type_files
-                ]
-            )
-        )
-        v(f"{mixer.get_num_channels()} channels set")
-        for name in type_files:
-            self.types[name] = []
-            for k in range(
-                1 if name in self.single_track_types else self.tracks_per_type
-            ):
-                self.types[name].append(mixer.Channel(i))
-                i += 1
-        self.sounds = {}
-        for name, files in type_files.items():
-            self.sounds[name] = SoundCollection(
-                name, files, volume=0.1 if name in self.background_track_types else 0.9
-            )
-
-    def manage_background_queue(self, name, type_channels):
-        for c in type_channels:
-            if c.get_queue() is not None and len(self.sounds[name]) > 1:
-                continue
-            v(name)
-            c.queue(self.sounds[name].next())
-            if c.get_queue() is None and len(self.sounds[name]) > 1:
-                c.queue(self.sounds[name].next())
+        for _, collection in self.types.items():
+            collection.load()
 
     def run_forever(self):
         while not self.stopped:
-            for name, type_channels in self.types.items():
+            for type_name, channels in self.type_channels.items():
                 if (
-                    name not in self.background_track_types
-                    or len(self.sounds[name]) == 0
+                    type_name not in self.background_track_types
+                    or len(self.types[type_name]) == 0
                 ):
                     continue
-                self.manage_background_queue(name, type_channels)
+                self.play_type_sounds(type_name)
             time.sleep(1)
-            self.load_sounds()
-
-    def play_type_sounds(self, type_name) -> int:
-        if len(self.sounds[type_name]) == 0:
-            return
-        max_sound_length = 0
-        for channel in self.types[type_name]:
-            sound = self.sounds[type_name].next()
-            max_sound_length = max(max_sound_length, sound.get_length())
-            channel.queue(sound)
-        return max_sound_length
 
     def run_lines_forever(self):
         while not self.stopped:
             time.sleep(random.randrange(*self.lines_delta_sec))
             length_sec = self.play_type_sounds("lines")
             time.sleep(length_sec + self.line_reaction_wait_sec)
+            length_sec = self.play_type_sounds("reactions")
+            time.sleep(length_sec + self.line_reaction_wait_sec)
             self.play_type_sounds("reactions")
 
+    def play_type_sounds(self, type_name) -> int:
+        if type_name in self.types and len(self.types[type_name]) == 0:
+            return
+        max_sound_length = 0
+        for channel in self.type_channels[type_name]:
+            if channel.get_queue() is not None and len(self.types[type_name]) > 1:
+                continue
+            sample = self.types[type_name].next()
+            max_sound_length = max(max_sound_length, sample.sound.get_length())
+            channel.queue(sample.sound)
+            if (
+                type_name not in self.single_track_types
+                and channel.get_queue() is None
+                and len(self.types[type_name]) > 1
+            ):
+                channel.queue(self.types[type_name].next_sound())
+        return max_sound_length
+
+    def get_status(self):
+        ret_strs = []
+        for type_name, channels in self.type_channels.items():
+            samples = []
+            for chan in channels:
+                sample = self.types[type_name].get_sample_from_channel(chan)
+                if sample is not None:
+                    samples.append(sample)
+            if samples:
+                sample_infos = [
+                    f"{s.path} @{s.sound.get_volume():.0%}vol" for s in samples
+                ]
+                ret_strs.append(f"{type_name}: {sample_infos}")
+        return "\n".join(ret_strs)
+
+    def pause(self):
+        if mixer.get_busy():
+            mixer.pause()
+            return False
+        else:
+            mixer.unpause()
+            return True
+
 
 def main():
     atmo = CampAtmo()
@@ -186,7 +149,7 @@ def main():
     atmo.start()
     try:
         while True:
-            time.sleep(100)
+            time.sleep(10)
     except KeyboardInterrupt:
         print("exiting...")
         atmo.stop()
diff --git a/collection.py b/collection.py
new file mode 100644
index 0000000..6f229fd
--- /dev/null
+++ b/collection.py
@@ -0,0 +1,161 @@
+import os
+import time
+from random import shuffle
+from dataclasses import dataclass, field
+
+os.environ["PYGAME_HIDE_SUPPORT_PROMPT"] = "hide"
+from pygame import mixer
+from typing import Union, Tuple, List
+from dirs import list_files_relative
+
+
+@dataclass
+class Sample:
+    path: str
+    abspath: str
+    mtime: float
+    size: int
+    sound: mixer.Sound
+    old_sounds: List[Tuple[mixer.Sound, float]] = field(default_factory=list)
+
+
+class SampleCollection:
+    extensions = ["ogg"]
+
+    def __init__(self, sample_dir: str, volume: float = 0.7):
+        self.db = []
+        self.volume = volume
+        self.topic_db = {}
+        self.sample_dir = sample_dir
+        self.index = 0
+        self.load()
+
+    def __len__(self):
+        return len(self.db)
+
+    def load(self):
+        prev_prefix = ""
+        for path, stat in list_files_relative(
+            self.sample_dir, extensions=self.extensions
+        ):
+            db_sample = self.get_sample(path)
+            if (
+                db_sample is not None
+                and db_sample.mtime == int(stat.st_mtime)
+                and db_sample.size == stat.st_size
+            ):
+                continue
+            abspath = os.path.join(self.sample_dir, path)
+            if stat.st_size == 0:
+                print(f"Warning, empty file: {abspath!r}", file=sys.stderr)
+                continue
+            topic = None
+            last_sep = path.rfind("/")
+            if last_sep > 0:
+                prefix = path[:last_sep]
+                topic = prefix
+                if prev_prefix != prefix:
+                    prev_prefix = prefix
+            self.add_sample(path, stat, abspath, topic, db_sample)
+
+    def add_sample(
+        self,
+        path: str,
+        stat: os.stat_result,
+        abspath: str,
+        topic: Union[str, None],
+        known_sample: Sample,
+    ):
+        if known_sample is None:
+            new_sample = Sample(
+                path=path,
+                mtime=stat.st_mtime,
+                size=stat.st_size,
+                abspath=abspath,
+                sound=mixer.Sound(abspath),
+            )
+            new_sample.sound.set_volume(self.volume)
+            self.db.append(new_sample)
+            if topic is not None:
+                if topic not in self.topic_db:
+                    self.topic_db[topic] = [new_sample.path]
+                else:
+                    self.topic_db[topic].append(new_sample.path)
+        else:
+            known_sample.old_sounds.append((known_sample.sound, time.time()))
+            known_sample.sound = mixer.Sound(abspath)
+            known_sample.sound.set_volume(self.volume)
+            known_sample.mtime = stat.st_mtime
+            known_sample.size = stat.st_size
+
+    def set_volume(self, volume):
+        self.volume = volume
+        for sample in self.db:
+            sample.sound.set_volume(volume)
+
+    def next(self):
+        if self.index == 0:
+            shuffle(self.db)
+        ret_sample = self.db[self.index]
+        self.index = (self.index + 1) % len(self.db)
+        return ret_sample
+
+    def next_sound(self):
+        return self.next().sound
+
+    def next_by_topic(self, topic: str):
+        if topic not in self.topic_db:
+            return
+        start_index = self.index
+        sample = self.next()
+        while sample.path not in self.topic_db[topic] and self.index != start_index:
+            print(f"trying sample {sample.path!r} for topic {topic!r}")
+            sample = self.next()
+        if self.index == start_index:
+            return
+        return sample
+
+    def next_sound_by_topic(self, topic: str):
+        next_sample = self.next_by_topic(topic)
+        if next_sample is not None:
+            return next_sample.sound
+
+    def get_sample(self, path: str) -> Union[dict, None]:
+        for sample in self.db:
+            if sample.path == path:
+                return sample
+
+    def get_sample_from_channel(self, channel):
+        ret_sample = None
+        c_sound = channel.get_sound()
+        if c_sound is None:
+            return None
+        for sample in self.db:
+            if sample.sound == c_sound:
+                ret_sample = sample
+        if ret_sample is None:
+            for sample in self.db:
+                for o_sample, _ in sample.old_sounds:
+                    if o_sample == c_sound:
+                        ret_sample = sample
+        for sample in self.db:
+            expired = []
+            for i, (o_sample, exp_time) in enumerate(sample.old_sounds):
+                if ((time.time() - exp_time) >= o_sample.get_length()) or (
+                    time.time() - exp_time < 0
+                ):
+                    expired.append(i)
+            for i in reversed(expired):
+                sample.old_sounds.pop(i)
+        return ret_sample
+
+
+# if __name__ == "__main__":
+#     mixer.init()
+#     chan = mixer.Channel(0)
+#     coll = SampleCollection("/home/jakob/dev/seba-audio/gincloud/samples/buzzwords")
+#     chan.queue(coll.next_sound_by_topic("agile"))
+#     chan.queue(coll.next_sound_by_topic("cloud"))
+#     print(coll.get_sample_from_channel(chan).path)
+#     time.sleep(7)
+#     print(coll.get_sample_from_channel(chan).path)
diff --git a/dirs.py b/dirs.py
new file mode 100644
index 0000000..61fce5a
--- /dev/null
+++ b/dirs.py
@@ -0,0 +1,35 @@
+import os
+
+
+def list_files_absolute(start_dir, extensions=None):
+    start_dir = os.path.expanduser(start_dir)
+    return _list_files(start_dir, start_dir, extensions)
+
+
+def list_files_relative(start_dir, extensions=None):
+    start_dir = os.path.expanduser(start_dir)
+    return _list_files(start_dir, start_dir, extensions, relative=True)
+
+
+def _list_files(start_dir, cur_dir, extensions=None, relative=False):
+    paths = []
+    with os.scandir(cur_dir) as scanner:
+        for entry in scanner:
+            if entry.is_dir():
+                paths += _list_files(start_dir, entry.path, extensions, relative)
+            elif (
+                extensions is not None
+                and any([entry.name.endswith("." + ext) for ext in extensions])
+            ) or extensions is None:
+                if relative:
+                    name = os.path.relpath(entry.path, start=start_dir)
+                else:
+                    name = entry.path
+                paths.append((name, entry.stat()))
+    return paths
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()
diff --git a/samples/buzzwords/agile/standup.ogg b/samples/buzzwords/agile/standup.ogg
new file mode 100644
index 0000000..2d97a00
Binary files /dev/null and b/samples/buzzwords/agile/standup.ogg differ
diff --git a/samples/buzzwords/agile/tickets-abarbeiten.ogg b/samples/buzzwords/agile/tickets-abarbeiten.ogg
new file mode 100644
index 0000000..01df57d
Binary files /dev/null and b/samples/buzzwords/agile/tickets-abarbeiten.ogg differ
diff --git a/samples/buzzwords/cloud/ab-in-die-cloud.ogg b/samples/buzzwords/cloud/ab-in-die-cloud.ogg
new file mode 100644
index 0000000..43c43c2
Binary files /dev/null and b/samples/buzzwords/cloud/ab-in-die-cloud.ogg differ