Straw,

A "red flag" immediately rose to the top of the pole when I not only read the information provided at the link you provided, but especially after doing a search on Google for "Mark Virkler" and reading much more of his teaching(s). One in particular is most salient which I will quote below:

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As a born-again, Bible-believing Christian, I struggled unsuccessfully for years to hear God's voice. I prayed, fasted, studied my Bible and listened for a voice within, all to no avail. There was no inner voice that I could hear! Then God set me aside for a year to study, read, and experiment in the area of learning to hear His voice. During that time, the Lord taught me four keys that opened the door to two-way prayer. I have discovered that not only do they work for me, but they have worked for many thousands of believers who have been taught to use them, bringing tremendous intimacy to their Christian experience and transforming their very way of living. This will happen to you also as you seek God, utilizing the following four keys. <span style="background-color:yellow">They are all found in Habakkuk 2:1,2.</span> I encourage you to read this passage before going on. <Source: Hearing God's Voice: 4 Keys>
What should be apparent is his faulty hermeneutic and exegesis of the Habakkuk passage. He, like so many who embrace and espouse error wrongly "divide the Word of Truth" to their own destruction. There is no warrant to take this passage of Scripture which is specific to Habakkuk, an ordained Prophet of God who was one of those "holy men of old" who was set apart to be part of God's plan to record His will in writing and which would eventually become part of the Canon, and use it to make a universal truth that applies to everyone. It isn't what happened to Habakkuk, i.e., God speaking directly to him that is relevant but rather the result of that encounter that is relevant and applicable; the result being the book of Habakkuk which we find in the Bible.

The writer of Hebrews makes the point in a much more succinct way when he wrote:

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Hebrews 1:1-2 (ASV) "God, having of old time spoken unto the fathers in the prophets by divers portions and in divers manners, hath at the end of these days spoken unto us in [his] Son, whom he appointed heir of all things, through whom also he made the worlds;"
And the Apostle Peter, standing upon this truth wrote the following to emphasize that that communication which even he experienced, i.e., hearing an actual voice from heaven; God the Father, is "inferior" to that which came thereafter, i.e., the inspired, infallible, inerrant written Word of God:

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2 Peter 1:16-21 (ASV) "For we did not follow cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty. For he received from God the Father honor and glory, when there was borne such a voice to him by the Majestic Glory, This is my beloved Son, in whom I am well pleased: and this voice we [ourselves] heard borne out of heaven, when we were with him in the holy mount. <span style="background-color:yellow">And we have the word of prophecy [made] more sure; whereunto ye do well that ye take heed, as unto a lamp shining in a dark place, until the day dawn, and the day-star arise in your hearts:</span> knowing this first, that no prophecy of scripture is of private interpretation. For no prophecy ever came by the will of man: but men spake from God, being moved by the Holy Spirit."
That some assert that they hear the voice of God or Jesus or the Spirit is true; i.e., they do "hear" something/someone. But that it is God Himself is what is questionable and repudiated by Scripture and the long history of the Christian Church.

In His grace,

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simul iustus et peccator

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