320 /* * attackv_vel(midisyn *ms, uint_fast16_t voice, * midipitch_t mp, int16_t level_cB, uint_fast8_t vel); * If the driver can do something useful with the voice's attack * velocity, such as vary the attack envelope or timbre, it should * provide this method. Velocity 64 represents the normal attack for * the patch, lower values are softer, higher harder. IF the driver * does not supply this method, midisyn will call the attackv method * instead, and include the velocity in the calculation of level_cB. */