v2.7.0
Input tab 'Set Gain' control overrides Windows Mixer Recording Devices. Accurately.
Extra Support setting including balance meter for touchy sound cards.
FM Squelch now more sane.
The K3 firmware AM-S autotrack bug cure broke the FM, FM-, FM+ mode cycling, but
that now cured too.
Rewritten Help file with Basic Install, more detail, larger view, more graphics.

v2.6.6
Greater resilience to high input levels from audio drivers.
Input 'Calibrate' control now changes displayed level only, not gain.
Intermittent display problem on some bandchanges cured.
Bandstack Modes and Filters Option checked as default.
Bandstack obstinacy debugged.
Minor cosmetic changes.

v2.6.0
Overdrive condition trapped
K3, K2 auto IQ reverse debugged
Waterfall frequency labels bug removed
Extraneous 'DSB' entry in Filter configure form removed.
Various cosmetic changes.
Help file rewritten

v2.5
Image corection values that are too high are ignored, and
in WBIR Calibration they generate a message about excess drive.
Various cosmetic changes.
To Do:
Help file will be rewritten.

v2.4.0

No longer defaults to LSB and Filter 3 before running.
WBIR calibration and setting interface is simpler.
Three deep bandstack on all bands except 60m and GEN which are five deep.
Option to recall bandstacked modes and/or filters.
Option for combined control of spectrum and waterfall display levels on Avg button.
All Recording go to 'NaP3 Recordings' folder in My Documents.
Multiple RX Audio recordings timed and dated like IQ recordings.
IQ and RX Audio recordings separately identified.
Many display colours now have alpha (saturation) controls.
'Button Selected' colour now changes on the fly.
Span resize now works in Spanascope mode.
Squelch state in non-FM modes now saved and restored.
Setup tab changed to begin support for input devices other than sound cards.
VAC tab moved.
Orion 'Peak Reset' bug eradicated.
Full length click to tune line in SpanaFall mode.
Click to tune filter now disappears when cursor is off the display.
FFT Windowing function selectable again (there you go, Jeff).
'6m jump' caused by K3 CAT corruption written around. 
Frequency increments > the displayed span (e.g. rig memories) in Fixed mode now Centre.
+-1 sound sample offset for some cheap cards.
Input 'Calibrate' control now changes NaP3 gain.

Help file extended to cover changes.