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Modeling of musical style and stylistic re-injection strategies based on the recombination of learned material have already been elaborated in music machine improvisation systems. Case studies have shown that content-dependant regeneration strategies have great potential for a broad and innovative sound rendering. We are interested in the study of the principles under which stylistic reinjection could be sufficiently controlled, in other words, a framework that would permit the person behind the computer to guide the machine improvisation process under a certain logic. In this paper we analyze this three party interaction scheme among the isntrument player, the computer and the computer user. We propose a modular architecture for Computer Assisted Improvisation (CAO). We express stylistic reinjection and music sequence scheduling concepts under a formalism based on graph theory. With the help of these formalisms we then study a number problems concerning temporal and qualitative control of pattern generation by stylistic re-injection.