Tone is distorted at onset

OS (e.g. Win10): Win7-32b
PsychoPy version (e.g. 1.84.x) 2020.1.3:
Standard Standalone? (y/n) If not then what?:Y
**What are you trying to achieve?:**Evaluation

What did you try to make it work?:
Added 440 Hz tone stimulus with amplitude of 0.5 and duration of 2s to experiment, issue present with and without Hamming windowing enabled.

What specifically went wrong when you tried that?:
Audio is noticably distorted for ~100 ms at onset.