Speaking Jelly Bean [UPDATE]
[UPDATE] Version 2.3.1 of Speak Here Now is now showing up in the Play Store. This version should work on Jelly Bean and previous devices. Feel free to let me know if you experience any other issues.
So it seems Jelly Bean (Android 4.1) has made a few changes to the way some of the voice controls work. Because of this, you may experience some problems if using Speak Here Now on a Jelly Bean device. I'm currently pushing out an update to fix the issue, but I takes some time for it to propagate across the Google servers.
Thank you for your patience as I fix this issue. Feel free to let me know of any additional issues in the comments, or by emailing me at firstname.lastname@example.org.