"talking" patches

hello, i'm fairly new to m4l. i'm trying to get around an audio to midi
issue via 2 tracks, an audio track for an input and a midi track for any vst live device i i could think of.
one major problem i seem to have is the lack of know how.
how can i create a patch that can talk with another patch across the session?
can this be done?
is there a simpler way then osc port mapping? (not sure even that would work)