Amplifi 75, using iPhone (iOS 11.3.1) on remote app. The half speed function will not work while a song is playing. You can pause the song, engage 1/2 speed, but when you resume, it is at full speed. You cannot go to 1/2 speed if the song is playing. This has been an issue since May. I was told this would be fixed in the next app update. Any timeframe for this?