Hi Andy,
I presume you've tried Max and ensured that it'll solve your problems? If not then you can download a free, fully-functional trial to check. I don't know what your technical background is, but from your previous posts I got the impression that you were wanting a 'turnkey' solution for your Pico - Max is definitely not that. Don't get me wrong, Max is fantastic (I use Max for Live myself and have used Max/MSP in the past), but it's a pretty steep learning curve depending on your technical ability. As dhjdhj has said, there is a very good support base for Max, but you'll still need to be prepared to put the hours in on the techy side.
Did you try the MIDI output as Mark Harris (Technobear) and I suggested? If it works reliably it won't be quite a flexible as Max, but it'll be a heck of a lot easier to use.
Also, don't forget that, if you're wanting to go the OSC route, you'll also need EigenD version 2 to use the OSC agent.
I'm not trying to put you off; I just want to be sure that you don't throw a lot of money at something without it ending up being the right solution.
Cheers,
Mark.