If you are using sequencer software, you can usually configure that so any MIDI from an input (in this case the i2M) can be sent to an output (PC USB Cable).
If running stand-alone, you need some software to do this for you. Midi Ox will let you do this: http://www.midiox.com/
Thank You for your answer. It's a big pity that is no possible use i2M stand alone like B2M or G2M for vocal. I tried the Midiox but the setup is very huge and I didn't receive any good result. I have installed the FL studio 9, but I am not able rape it to play only in one instrument. For each note play different instrument. The same situation is in the Cakewalk 8. If I can change the instrument i cakewalk the sound is lost or freezed (continuous sound of one note). If I change something in Sonuus software the situation is the same and converter is not working. I try it on different PC (winXP and win7) and the result is the same. I am disillusioned and I am thinking about returning of commodity to main seller:-(. I need useful tool for simply changing my vocal to sound in my Yamaha DTX 12 multi. I thing that the best improving of your i2M musicport software is implementation of easy setup MIDI IN (i2M of course) and MIDI out device, include an instrument in GM or different standard.
I tried everything only with software sequencer for bugs elimination.
Thank you for your answer.