No, that's the whole point of using schottky diodes - at low currents, some schottkys have a Vf as low as 150mV. Seriously, unless you're using Invaders or something similar, this project is likely to disappoint. When you can pick up a DS-1 or a YJM-308 for less than fifty bucks (or a B€hring€r or Dan€l€ctro for half that), why even bother?
I agree and some shottkys can have a .5 vf. It will be a crackly sound at best.