Select what type of modulation the scanner should use for this frequency or channel. (Only the modulation types available for this frequency or channel are displayed.)

Auto	The scanner uses the default modulation type for this frequency. You can change the default by editing the Band Tables (BCD396XT/BC346XT Band Defaults, BCD996XT Band Defaults, BCT15X Band Defaults).
AM	The scanner treats the frequency as AM modulation.
NFM	The scanner treats the frequency as Narrowband FM modulation (about 7.5 kHz deviation; also referred to as SNFM in some references).
FM	The scanner treats the frequency as FM modulation (about 15 kHz deviation; also referred to as NFM in some references).
WFM	The scanner treats the frequency as Wideband FM modulation (over 100 kHz deviation; used for pre-digital conversion TV broadcast reception and similar).
FMB	The scanner treats the frequency as FM broadcast modulation (about 75 kHz deviation; used for FM radio station reception and similar).

It is important that you correctly set the modulation type for the channel you are programming. If you program a channel as NFM that is transmitting in FM mode, the audio will sound too loud as compared to correctly programmed channels. Similarly, if you program a channel as FM that is transmitting in NFM mode, the audio will be too quiet as compared to correctly programmed channels. Incorrectly matching the modulation setting to the actual modulation used is the biggest reason for unbalanced audio between channels.