Hi developpers, here is an idea.
since the PB60x and 90x have inner synth and G sensor, why not combining the two in a funny app replicating the theremin musical instrument

X axe dedicated to volume and Y axe dedicated to frequency.
mathematically generated triangle or sine wave.... and >Voilą ... an innovative and quitely evocative new app.
some functions like octave selection, tremolo speed and the like,dedicated to keys control...
And... as we are on the subject of new applications, How simple mortal as me, could build himself a new app for those shinny things(60x and 90x)?
bye
Dag