Only way I can “see” that possible would be if you´re having an hardware interface inbetween your galaxy S4 and OT. So that interface takes care of transmitting MIDI messages from your TouchOSC. In that case your OT will regard it as any general midi controller…

I don´t know much about TouchOSC regarding if it transmitting any midi messages as well besides its OSC messages. If it doesn´t, you´ll need an app that converts OSC into MIDI first.

That is: TouchOSC (=> + extra MIDI app?) => hardware device/cable (that connects to your phone and got MIDI connectors in the other end) => OT

I don´t know if there exist a such device/cable though that you could connect directly to whatever kind of port you got on your smartphone (micro USB?), that got MIDI IN/OUT at the other end. However, there do exist plenty of normal USB to MIDI cables (i e ESI Midi Mate) but there will probably be troublesome issues with drivers since these are written for Windows OS and/or Mac OS. Haven´t seen any brand that claims driver compatibility with Android too…

BUT… have a look into this instead (it´s quite a bit neater, don´t you think!?):