do_shelving_filter(delay_effect_buffer, count, delay_status.high_coef, delay_status.high_val);
do_filter_iir1_lowpass_stereo(delay_effect_buffer, count, &(delay_status.lpf));
void do_ch_delay(int32 *buf, int32 count){	if ((opt_reverb_control == 3 || opt_reverb_control == 4			|| opt_reverb_control < 0 && ! (opt_reverb_control & 0x100)			|| opt_effect_quality >= 1) && delay_status.pre_lpf)		do_shelving_filter(delay_effect_buffer, count, delay_status.high_coef,				delay_status.high_val);	switch (delay_status.type) {	case 1:		do_3tap_delay(buf, count);		break;	case 2:		do_cross_delay(buf, count);		break;	default:		do_basic_delay(buf, count);		break;	}}