Not sure why everyone is having difficulty with Bluetooth keyboard and the sounds...my BT keyboard makes all the same sounds as the Hanx writer keyboard. Make sure the sounds are on in the app settings. However, before the update to ios 8, the Hanx writer keyboard would disappear when my bluetooth was connected. This was great because I felt like I was really typing on an authentic typewriter. I miss being able to do that. Bit silly using my bluetooth while the screen is still filled with the app keyboard. Please fix it! Not using the app as much as I would like because of that - neither am I recommending it to friends.
Jakenlil about Hanx Writer, v1.1