1) Know/imagine that there is going to be an extremely quiet sound that you are going to hear in your mind. It's so quiet, it's quieter than even your thoughts. It will be very very subtle so you're going to have to listen very carefully. If you want to anticipate that this sound will be a voice, that's ok too, but it's going to be really really quiet and barely noticeable.
2) Spend time listening really really carefully within, listening for this very quiet sound. Do not try to listen for 'silence' or to become silent or to silence your thoughts - that's too hard. Anticipate there will be a very quiet sound you're trying to find. You're trying to seek out a very quiet sound in your mind and it's going to be really almost too quiet to notice unless you listen really really intently, so you're going to have to pay really careful attention.
3) Do this for a while and you'll probably drift into normal thinking several times and go off on tangents. Hopefully you'll remember to come back to listening for this quiet sound again and focus again on listening intently. When I did this I got distracted several times but kept coming back to listening for something very very quiet.
4) At some point when you're ready and you've been doing this a while, your mind will have quieted down and you'll be quite focused, and you'll notice you haven't heard the sound yet. If you heard thoughts or voices that's ok, but that's not the sound we want. We want to focus on something subtler, a bit like transcendental meditation. However, we're now going to switch our focus a little bit.
5) Instead of listening for that quiet sound, which we didn't hear yet ;-), we're going to now shift to listening to God. The sound is going to come from God. We're going to put all our attention on God and listen really really carefully in his direction, just as before, because God has a really quiet voice. Just listen intently, be receptive.
6) You should hopefully notice that you feel you are directly 'in front of God' and that He is right in front of you, with nothing else coming between you. It may feel more intimate than you've ever felt with God before. And you'll just keep listening and staying focused on His presence, listening to what sound He might make. You can stay doing that as long as you like.
7) Optional final step, if you want, is to ask God something, and then continue listening to see if he will answer. Even if you don't do this step, I feel it's been helping in quieting your mind and helping you to focus on God, which is communion, which is good. I was really surprised how much I felt I was in direct contact with God more than ever before, with no middle-men/thoughts anywhere.
Give it a try ?