Two things:
1) Pure Music uses iTunes as it's GUI, so using an iTunes remote like the great Apple Remote app works on an iPad, iPod touch, iPhone, etc. And doing things like polarity inversion is simply to comment "invertpolarity" within iTunes comment section, on those songs you wish it done to.
2) If, instead, you want to go away from iTunes and use the "less is more" GUI from PM (not sure why you'd do that...it's no more pure or cleaner than using iTunes GUI) then using any of the recommended VNC apps (I use LogMeIn Ignition) to emulate a screen share on your iPad...that works too. However, it is robbing Peter to pay Paul cuz now instead of the miniscule overhead that the iTunes GUI has (remember, PM in normal mode ain't playing iTunes, just using it's GUI) now you are using a significant amount of overhead to do VNC/screen sharing! Not my recommended approach. But to do non-iTunes play stuff (play FLAC, doing tagging, etc) you may want to deal with VNC stuff.
I use LogMeIn Ignition to do remote administration, etc but I never use it to play Pure Music.
