BPM Wizard works well with Dance and Techno music with only a sound card

Plug a HIFI, walkman, discman or whatever music device in the line in of your soundcard, or put a music CD in your computer
Play the music
Run the sound mixer program to set your recording parameters to record the line in or the CD
Run the BPMWizard and watch

Once the BPM is locked the program is completely synchronized with the music and you can see it beat with the music. It might be difficult to synchronize with the music, so be patient, it can last between 8 and 30 seconds.