UAD Powered Plug-Ins Manual v5.2 - Just Music

14dB
Typical starting point for mastering where minimal gain reduction is desired.
This setting is equivalent to having a real hardware 33609 connected
to a +4 interface with +14dB headroom.
Note: Keep in mind there are no hard and fast rules. Use the above recommendations
as guidelines and feel free to experiment with the various positions
of the headroom switch regardless of the audio source. If it sounds
good, use it!
Factory Presets
The UAD Neve 33609/33609SE includes a bank of factory presets. These
presets can be useful starting points for your particular source audio.
The factory preset names begin with MSTR, BUSS, or TRAK. These indicate
the setting of the headroom parameter. (14dB, 18dB, and 22dB respectively).
Mastering (MSTR) presets are optimized for mixed program material that is already
at a relatively high level.
Buss/group (BUSS) presets are optimized for subgroups of audio, such as a
drum group or vocal group. This type of application often has lower levels
than full mixes, but higher levels than a track insert.
Track (TRAK) presets are optimized for track inserts where signal levels typically
aren’t as hot as groups or outputs.
The preset names are guidelines and not rules. In many cases, you can use
any preset on any source with good results. You will probably need to adjust
the threshold and/or gain controls to obtain the optimum results with your particular
source audio.
Power
The Power switch determines whether the plug-in is active. This is useful for
comparing the processed settings to that of the original signal, or to bypass
the plug-in to reduce the UAD DSP load. Toggle the switch to change the
Power state; the switch is illuminated in red when the plug-in is active.
Note: You can click-hold the power switch then drag it like a slider to quickly
compare the enabled/disabled state.
UAD Powered Plug-Ins Manual - 165 - Chapter 17: Neve 33609 Compressor