[Elecraft] K3: PRE/ATT Bug or feature?

[Bill McDowell]

My K3 (SN 1069, fw 4.03) has always exhibited the ability to have PRE and ATT on simultaneously.  If one engages ATT by a long hold, then hits PRE with a tap (same button), the display shows both functions engaged.  The converse is true too, i.e. PRE engaged with a tap, followed by ATT with a long hold.

Signal levels by ear and S-meter seem to indicate both features are on simultaneously.  The appropriate length hold will turn one feature off, as indicated by the display.  Levels change accordingly.

Is this a bug, or an undocumented feature?  The feature(s) being a PRE function with less gain or a ATT with less attenuation.

73
Bill, K4CIA