Yeah!!
I would be happy to call my friend with a ladspa vocoder on my voice!! or making them wait with a Mini Moog just recorded impro !!!
Seriously, there is surely a lot of applications for the audio in our devices...Of course security ones should be funny ( a loop of "- Hey, I'm happy to be here, in my house today, I like to sit in my chair, with the sun and all...Hey I'm happy..." for make your neighbourg thinking your here, while, in fact, you're away, hehehehe!!...), kind of (de-)crypting for voice, change your voice to appear to be a women while your a old black man... or the contrary

...
I'd love to have
Bristol, or a sample player in my phone like
simsam and it should be perhaps more realistic than any voice reconition or synthesis because such things just don't exist in the opensource world
AFAIK!
I found the
nsound project is pretty active and provide quite good tools for audio handling in C++, synthesis, some filters...
But the screen is a little bit small to make music software ergonomics...even the old tracker I used when i was a kid was on a 12 or 13 inch monitor... but multiple views (edit, sequence, keyboard and files) can be the trick to handle a lot in a little device.
...We definetly lack a good MPC replacement software suite for our phones!
