diff --git a/csoundengine/synth.py b/csoundengine/synth.py
index 9e51bb7..faeec39 100644
--- a/csoundengine/synth.py
+++ b/csoundengine/synth.py
@@ -105,7 +105,7 @@ def ui(self, **specs: tuple[float, float]) -> None:
         return ui(self, specs=specs)
 
 
-def ui(specs: dict[str, tuple[float, float]]):
+def ui(event, specs: dict[str, tuple[float, float]]):
     from . import interact
     dynparams = event.dynamicParamNames(aliases=True, aliased=False)
     if not dynparams:
@@ -617,9 +617,14 @@ class SynthGroup(BaseSchedEvent):
     __slots__ = ('synths', 'session', 'autostop', '__weakref__')
 
     def __init__(self, synths: list[Synth], autostop=False) -> None:
-        start = min(synth.start for synth in synths)
-        end = max(synth.end for synth in synths)
-        dur = end - start
+        if not synths:
+            start = 0.
+            end = 0.
+            dur = 0.
+        else:
+            start = min(synth.start for synth in synths)
+            end = max(synth.end for synth in synths)
+            dur = end - start
         BaseSchedEvent.__init__(self, start=start, dur=dur)
         flatsynths: list[Synth] = []
         for synth in synths:
@@ -629,7 +634,7 @@ def __init__(self, synths: list[Synth], autostop=False) -> None:
                 flatsynths.append(synth)
         self.synths: list[Synth] = flatsynths
         self.autostop = autostop
-        self.session = self.synths[0].session
+        self.session = self.synths[0].session if synths else None
 
     def __del__(self):
         if self.autostop:
@@ -821,10 +826,14 @@ def ui(self, **specs: tuple[float, float]) -> None:
 
     def _repr_html_(self) -> str:
         assert jupytertools.inside_jupyter()
+        bold = lambda txt: span(txt, bold=True)
+        span = jupytertools.htmlSpan
+
+        if not self.synths:
+            return f'{bold("SynthGroup")}(synths=[])'
+
         if config['jupyter_synth_repr_stopbutton']:
             jupytertools.displayButton("Stop", self.stop)
-        span = jupytertools.htmlSpan
-        bold = lambda txt: span(txt, bold=True)
         now = self[0].session.engine.elapsedTime()
         start = min(max(0., s.start - now) for s in self)
         end = max(s.dur + s.start - now for s in self)
diff --git a/pyproject.toml b/pyproject.toml
index dc7d0c1..b045cdf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ dependencies = [
 
     "ctcsound7>=0.4.6",
     "sndfileio>=1.9.4",
-    "emlib>=1.15.0",
+    "emlib>=1.16",
     "configdict>=2.10.0",
     "bpf4>=1.10.1",
     "numpyx>=1.3.3",
diff --git a/setup.py~ b/setup.py~
deleted file mode 100755
index 5ebd005..0000000
--- a/setup.py~
+++ /dev/null
@@ -1,71 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-from setuptools import setup
-import os
-
-version = (2, 10, 5)
-
-from os import path
-this_directory = path.abspath(path.dirname(__file__))
-with open(path.join(this_directory, 'README.rst'), encoding='utf-8') as f:
-    long_description = f.read()
-
-
-def package_files(directory):
-    paths = []
-    for (path, directories, filenames) in os.walk(directory):
-        for filename in filenames:
-            paths.append(os.path.join('..', path, filename))
-    return paths
-
-
-datafiles = package_files('csoundengine/data')
-
-
-setup(
-    name='csoundengine',
-    python_requires=">=3.9",
-    version=".".join(map(str, version)),
-    description='A synthesis framework using csound',
-    long_description=long_description,
-    author='Eduardo Moguillansky',
-    author_email='eduardo.moguillansky@gmail.com',
-    url='https://github.com/gesellkammer/csoundengine',
-    packages=[
-        'csoundengine',
-    ],
-    install_requires=[
-        "numpy",
-        "scipy",
-        "matplotlib",
-        "cachetools",
-        "JACK-client",
-        "appdirs",
-        "pygments",
-        "sf2utils",
-        "ipywidgets",
-        "progressbar2",
-        "xxhash",
-        "docstring_parser",
-        "typing_extensions",
-
-        "ctcsound7>=0.4.6",
-        "sndfileio>=1.9.4",
-        "emlib>=1.15.0",
-        "configdict>=2.10.0",
-        "bpf4>=1.10.1",
-        "numpyx>=1.3.3",
-        "pitchtools>=1.14.0",
-        "risset>=2.9.1",
-        "sounddevice"
-    ],
-    license="BSD",
-    classifiers=[
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)'
-    ],
-    package_data={'csoundengine': datafiles},
-    include_package_data=True,
-    zip_safe=False
-)