Hi Toasterpastries and yoyz2k, thanks for your answers!
The tablet that I have is not an Android one (sorry for the confusion), it's a freestanding touch tablet for the PC, it's called a Sensel Morph.
TouchOSC would've been a good choice if I used Android! But I don't think it will work in my case.
Hmm yeah perhaps I should read more about the Midi protocol. It could work. At least initially, because I'd like to send at least 2 different pitch bends for each note (along with velocity). I know that Midi can send velocity, but I'm not sure if the protocol can handle two more values.
Seems like what I'm trying to do is a VST plugin. (Yeah, I'm very noob)
Apart from figuring out how to make the actual VST plugin, I also need to figure out which software to plug it into. It should be a software that can receive signals with notes, velocity and pitch bends, and then convert it to sound.
Do you have any suggestions?
Thanks again!