for (i = 0; i < samples; i++)
btr_output[i] = read_u16(output + i + skip_idx);
btr_add_output((char *)btr_output, samples * 2, btrn);
for (i = 0; i < samples; i++)
btr_output[i] = read_u16(output + i + skip_idx);
btr_add_output((char *)btr_output, samples * 2, btrn);