I don't know how to do that ?.
Show the MIDI track in the Piano Roll View, PRV. Grab the C and bring it up an octave. Does it play? If not bring it up another octave. If it still doesn't play bring the C down 3 octaves; that's one octave below the starting octave. Does it play now? If no bring it down another octave. If it still doesn't play you have a problem.
Bass like guitar are written an octave higher than they sound. GM instruments always use all 88 piano notes so they never have a problem. But when you get into much better instruments like ST3 those instruments are within the range of the actual instrument they are emulating.
Now the problem with bass and guitars is that if the VSTi is expecting the notes to be as written but the track sends the actual note, the one that is one octave lower than written, some notes will be out of the range and not play. The same holds true if the VSTi expects the note to be an octave lower but the track sends the written notes then the bass will play an octave higher.
You just have to figure which scenario it is and the easiest way is to transpose the entire track up and/or down until it sounds good. Even then sometimes you have to select another bass sound for good results.
I hope this helps and doesn't confuse you too much!