diff --git a/eegnb/experiments/Experiment.py b/eegnb/experiments/Experiment.py
index 539dc396..f02c56e7 100644
--- a/eegnb/experiments/Experiment.py
+++ b/eegnb/experiments/Experiment.py
@@ -188,8 +188,7 @@ def iti_with_jitter():
                 if rendering_trial < current_trial:
                     # Some form of presenting the stimulus - sometimes order changed in lower files like ssvep
                     # Stimulus presentation overwritten by specific experiment
-                    ii, trial = next(iterate_events)
-                    self.__draw(lambda: self.present_stimulus(ii, trial))
+                    self.__draw(lambda: self.present_stimulus(current_trial))
                     rendering_trial = current_trial
             else:
                 self.__draw(lambda: self.window.flip())
diff --git a/eegnb/experiments/auditory_oddball/aob.py b/eegnb/experiments/auditory_oddball/aob.py
index bc82675e..619eec1d 100644
--- a/eegnb/experiments/auditory_oddball/aob.py
+++ b/eegnb/experiments/auditory_oddball/aob.py
@@ -1,8 +1,12 @@
 import numpy as np
 from pandas import DataFrame
 from psychopy import prefs
+
 # PTB does not yet support macOS Apple Silicon, need to fall back to sounddevice.
-prefs.hardware['audioLib'] = ['sounddevice']
+import sys
+if sys.platform == 'darwin':
+    prefs.hardware['audioLib'] = ['sounddevice']
+
 from psychopy import visual, core, event, sound
 
 from time import time
@@ -73,11 +77,11 @@ def load_stimulus(self):
 
         return 
     
-    def present_stimulus(self, idx : int, trial):
+    def present_stimulus(self, idx: int):
         """ Presents the Stimulus """
 
         # Select and play sound
-        ind = int(trial["sound_ind"])
+        ind = int(self.trials["sound_ind"].iloc[idx])
         self.auds[ind].stop()
         self.auds[ind].play()
 
diff --git a/eegnb/experiments/visual_n170/n170.py b/eegnb/experiments/visual_n170/n170.py
index 4cf42aad..6c41fbba 100644
--- a/eegnb/experiments/visual_n170/n170.py
+++ b/eegnb/experiments/visual_n170/n170.py
@@ -41,7 +41,7 @@ def load_stimulus(self):
         # Return the list of images as a stimulus object
         return [self.houses, self.faces]
         
-    def present_stimulus(self, idx : int, trial):
+    def present_stimulus(self, idx: int):
         
         # Get the label of the trial
         label = self.trials["parameter"].iloc[idx]
diff --git a/eegnb/experiments/visual_p300/p300.py b/eegnb/experiments/visual_p300/p300.py
index 08560d1a..d6a8a1df 100644
--- a/eegnb/experiments/visual_p300/p300.py
+++ b/eegnb/experiments/visual_p300/p300.py
@@ -35,7 +35,7 @@ def load_stimulus(self):
         
         return [self.nontargets, self.targets]
 
-    def present_stimulus(self, idx:int, trial):
+    def present_stimulus(self, idx: int):
 
         label = self.trials["parameter"].iloc[idx]
         image = choice(self.targets if label == 1 else self.nontargets)
diff --git a/eegnb/experiments/visual_ssvep/ssvep.py b/eegnb/experiments/visual_ssvep/ssvep.py
index 46119f55..94ae9121 100644
--- a/eegnb/experiments/visual_ssvep/ssvep.py
+++ b/eegnb/experiments/visual_ssvep/ssvep.py
@@ -91,8 +91,8 @@ def init_flicker_stim(frame_rate, cycle, soa):
             init_flicker_stim(frame_rate, 3, self.soa),
         ]
 
-    def present_stimulus(self, idx, trial):
-        
+    def present_stimulus(self, idx: int):
+
         # Select stimulus frequency
         ind = self.trials["parameter"].iloc[idx]