lower volume on audio clip C#

this may sound like a silly question, but how do I change the volume of the audio clips I have put in a script. the audio.volume = 0.0; doesn't work as it changes the audio source, but not what's in my script. here is part of it:

public AudioClip footSteps1;

AudioSource.PlayClipAtPoint(footSteps1, transform.position);

those are what I used, so how do I change the volume of them???

You'd use the overload of the function with a volume parameter:

float volume = 0.5f;
AudioSource.PlayClipAtPoint(footSteps1, transform.position, volume);