TransMIDIfier provides convenient MIDI routing and virtual instrument patch switching and customization for the working musician. TransMIDIfier works by functioning as a "middle man" between the sequencer and the sample player. TransMIDIfier reinterprets the incoming MIDI data in powerful ways before passing it along to the sample player.
Key Features
Switch among instrument patches from a single MIDI track via keyswitches or program changes, regardless of sample player.
Selectively combine multiple, arbitrary instrument patches from different manufacturers to create powerful new sounds.
Apply transformations to MIDI data to customize instrument behavior and performance.
http://www.bewaryprods.com/software/products/TransMIDIfier/