HMM statistics toolbox, dimension of the observations

Is it possible to use the HMM functions (hmmtrain,...) from the Statistics Toolbox with more dimensional sequences? e.g. I have sequences of four features (nothing gene related). That means, my feature (observation, output) vector is four dimensional and I have sequences of this four dimensional vectors to classify. In all examples in the Statistics Toolbox Users guide the sequences are always one dimensional. Thank you !