UT/UT400 v3.2

Added support for blocks 470, 19 and 944.

UT/UT400 v3.1

Replaced subsonic filter with a quieter one, for a slight improvement in noise performance.

UT/UT400 v2.4

Latest version compatible with Philips PLL. Backport of v3.1 for use on older units.

UT/UT400 v3.0

Switched to National LMX2353 PLL.

UT/UT400 v5.1

Added the ability to configure the power switch as a mute function if desired.