SND_VOL_C_END
for (vc = SND_VOL_C_BEGIN; vc <= SND_VOL_C_END;
for (vc = SND_VOL_C_BEGIN; vc <= SND_VOL_C_END;
KASSERT(c != NULL && vc >= SND_VOL_C_BEGIN && vc <= SND_VOL_C_END,
if (value < SND_VOL_C_BEGIN || value > SND_VOL_C_END)