The Morse Decoder app for iPhone and iPad has been upgraded to version 1.7. It now includes a new High Speed WPM mode switch to support decoding really fast QRQ WPM speeds from 40 to 80 WPM. Morse code just sounds like a blur at those rates. The HotPaw Basic app includes a "morse" command which supports sending Morse Code sounds up to 99 WPM.
The HotPaw Music Spectrograph update to version 1.1.2 will now allow you to analyze music from your iTunes Library. Hit the "Song" button, and it will let you select a tune to convert and visualize in spectrograph form. You can stop and replay sections of music to (re)hear what interesting looking segments of the spectrum graph sound like. I used it to help transcribe some complicated fast piano riffs. Currently does monophonic analysis only.
Sing-inTuna update version 2.1.3 includes a fix for a rare problem where someone reported the app needed to be force quit and restarted to get audio working again.