Hi everyone,
I’m completely new to Psychopy Builder and I’m trying to build an experiment where I play sounds either to the right or left ear with a variable delay before they start, either 500 or 1500 ms.
In my conditions file I have two parameters in_dur with either 0.5 or 1.5 values and soundfile left.wav or right.wav. I can use $soundfile for my sound object, but I don’t get the variable start when I try to use $in_dur in the start parameters of my sound object. How can I get this to work?
Any help will be greatly appreciated 
OS (e.g. Win10): Win 8.1 Enterprise, 64bit
PsychoPy version : 2021.1.2
**What are you trying to achieve?: I want my stimulus, a sound, to start either at 0.5 or 1.5 seconds depending on the trial.
**What did you try to make it work?: In my conditions excel file, along with other parameters, I have 1 parameter called in_dur with either 0.5 or 1.5 for the different trials. So, in the sound properties I tried to use $in_dur, so it would draw either 0.5 or 1.5 depending on what’s on the file.
**What specifically went wrong when you tried that?: I get this message
if Sound1.status == NOT_STARTED and tThisFlip >= asarray($int_dur)-frameTolerance:
^
SyntaxError: invalid syntax
And the experiment doesn’t run.