Midifier VST

Midifier is an audio plugin that converts monophonic audio tracks to MIDI data in real-time. Using Midifier, you can control your MIDI devices vocally or with another instrument.

Midifier can also act as a substitute for MIDI keyboard.
Put some audio material on one track in your sequencer, set up Midifier and a MIDI track for output, and press the play the button of your sequencer.