Don't personally know what the f means in -sf, but take it you have created symbolic links named '/dev/dsp1' and '/dev/dsp'. If so, why not simply destroy them?
Look to see if the symbolic links exist using the ls command. They might show in a light blue colour. Remove them with:
rm /dev/dsp1 /dev/dsp
I'd be a bit nervous about following this advice; deleting devices seems slightly scary.