i'm a bass, I can bring my head voice down to C2 and up to... whatever that is in machine gunn eddie. Anyways, i've been working at it for at least 2 years and there's just no bridge, and no mixed voice. I've resorted to staying in belt but my belt can only go so high before it starts to sound very strained and i have to push intensely to sustain it. I've tried all the exercises for 'mix' or bridging, and done the whole laying on your back, leaning over, standing on your head, hanging upside down, whatever, i think i just dont have it, eh?