lnb_set_tone
res = lnb_set_tone(dev, port->lnr, dvb->input, tone);
lnb_set_tone(dev, l, 0, SEC_TONE_OFF);
lnb_set_tone(dev, l, 1, SEC_TONE_OFF);
lnb_set_tone(dev, l, 2, SEC_TONE_ON);
lnb_set_tone(dev, l, 1, SEC_TONE_ON);
lnb_set_tone(dev, l, 2, SEC_TONE_OFF);
lnb_set_tone(dev, l, 3, SEC_TONE_ON);