Hyundai H- CDM8039 - Manual (Page 13)

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During MASK DPI mode, the unit will mask only the AF which has different PI, this is the default mode; during MASK
ALL mode, the unit will mask the AF which has different PI and no RDS signal with high field strength.
RETUNE S/L - SHORT/LONG
“RETUNE” refers to the time period the unit allows for radio scan when reception is interrupted. “S” represents a time
period of 30 seconds and “L” represents a time period of 90 seconds.
AUDIO DSP CONTROLS
Choose equalizer mode: POP M => ROCK M => CLASS M=> FLAT M =>DSP OFF.
LOUDNESS CONTROLS
Select LOUD ON or OFF. In ON mode the bass and treble response will be boosted.