14xx is an effect of multiple uses, including

Commodore 64

The 14xx effect sets a combination of low pass, band pass and high pass filters according to the following table:

Value of xx Low pass filter Band pass filter High pass filter
00 Disabled Disabled Disabled
01 Enabled Disabled Disabled
02 Disabled Enabled Disabled
03 Enabled Enabled Disabled
04 Disabled Disabled Enabled
05 Enabled Disabled Enabled
06 Disabled Enabled Enabled
07 Enabled Enabled Enabled

SEGA Mega Drive/Genesis