I really do not have a problem playing with a video, CD, etc. that has the bass track.
In fact that is how I practice all the time. I take my fake chord and then play that with a video I've called up. Having the bass track on the video has not proved to be a large problem. I just google these key words; Video, "name of the song" and take my pick. I think I'm so focused on the song and what I'm doing I tune out the bass on the video. For some reason it's not a problem for me.
Give it a try -- like has been said if you are listening from a CD player, turn down the bass volume. Or with the videos you call up on your computer use one of the software programs that let you mute the bass frequencies, if you do have a problem with the bass track coming through. If you can do that there are thousands of play-a-longs just waiting for you on the Internet.
Matching the key; yes that enters into the process, but, that is not hard to do, just listen for the tonal center and adjust your fake chord to the key that is being used. If you use Nashville numbers, like I do, just adjust the box position and away you go.
Fake chord http://tabs.ultimate-guitar.com/m/ma...e_ver2_crd.htm
Notice this fake chord is not in the key I need for the following video.........
I hear A.
Matching the key - I use a keyboard for this. Let the song play and then run up the white keys from the C. It came in sync on the A. And the fake chord I have from the church is in A. They specifically pointed me to Marie Barnett's version of this song to practice with - so another reason to think A is the correct key.
Which means the Internet fake chord, listed above needs to be adjusted to A, if that is what you will be using. Notice the transpose button at the fake chord site.