There are several ways to remove vocals from a song. Here are some of them:

1. Using specialty software: You can choose vocal eliminator software and install an audio equalizer software package. Then open the song file and follow the instructions. Adjust the audio equalizer to preserve the bass tones.

2. Using CyberLink: To remove the vocals, drag the Vocal Volume slider all the way to -inf. Preview the adjusted audio to ensure that you are satisfied with the result, then click Apply. With the vocal tracks gone, you will see the difference in the track's audio waves. Click on File and save the song without vocals to your computer.

3. Using VideoProc: To remove the vocals, you'd better know the general range of vocals in the song. Enter two values between 0 and 200000, for example, input 100 as the lowest frequency and 12000 as the highest. Things are different in different songs, so it's better to figure out the specific range of vocal frequency in the song you are going to process.

4. Using Audioalter: The vocals are removed by using the OOPS (Out Of Phase Stereo) effect. The OOPS effect relies on that most songs have the vocals perfectly centered while the instruments are panned slightly to the left and right channel.

5. Using Vocal Remover Online: Upload your file into their website and wait for processing. Preview results and download tracks.

I hope this helps!