We do not exhale lactic acid, the kidneys handle the elimination of most organic acids, of which most are non volatile (are not released as a gas). The beauty of our buffering system is having the ability for releasing the ONLY volatile organic acid (CO2). In this way we can rapidly remove acid and not have to depend on a slower filter system (renal) to accommodate such rapid changes. In diseased states (such as diabetic ketoacidosis) other volatile organic acids (acetone) are released, but this is not how our body's maintain pH. A common trigger for hyperventilation in trumpet players would be anxiety [not while playing, but rather prior to a performance or between rest breaks]. Normal playing does not trigger ANY metabolic pH imbalance, because the great creator designed a fabulous system as noted above. No, not quit, this is handled by secretin release once this acid hits the duodenum, this stimulates bicarb secretion from the pancreas and the bone doesn't even feel the stress of such changes. What would contribute to the POTENTIAL to leach calcium out of bone is all the phosphate that is absorbed from soft drinks/sodas. You must breath VERY RAPIDLY to hypERventillate. Breathing in deep without increasing the loss of gas and there for a drive for gas exchange, will not contribute significantly to a loss of CO2 from the BODY.