Samplitude Pro X & Jam Origin Midi Guitar VST Plug-in
Jam Origin Midi Guitar is a VST plug-in which can convert the live audio from your guitar into a MIDI signal . It can then be used to trigger any VSTi Synth. This tutorial shows you how to set it up in Samplitude Pro X/Sequoia.You can download the demo for the plug-in from : http://www.jamorigin.com/midi-guitar/...
Although the plug-in is still a beta version it works very well and they are developing an algorithm for bass guitar as well.