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Audio works well for me on an SE1, but the app occasionally crashes out.
Still pretty buggy.
 
I’m taking a Spanish class and have been using it for pronunciation assistance last night and a lot of the day today. I have not experienced any problems, crashes, delays, etc. Using an 11 pro.
 
I’m taking a Spanish class and have been using it for pronunciation assistance last night and a lot of the day today. I have not experienced any problems, crashes, delays, etc. Using an 11 pro.

For me the crashes seem to happen when switching from portrait to landscape and viceversa.
 
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