Audio issues - sound therapist

[andasalchemy]

I am a sound therapist and I conduct online sessions and webinars and even with a highly sensitive mic, zoom seems to completely suppress the sound of the tuning forks and bowls. I have already tried to adjust the audio settings but I think I am doing something wrong, as nothing seems to change... it's like my 'background' noise is completely silenced and all one can hear (barely) is my voice. Any insights greatly appreciated. 

I am using a Macbook Pro with Focusrite external audio card and condenser mic.