Thanks for responding Bob. I spent some time comparing the programs in detail because I want to understand what tweaks make them unique. I found the Miprosoft G2 Patch Editor invaluable for this as it lets you quickly see all the program settings in one screen. Here's a quick summary of what I discovered:
Classic Detune: Programs 79 and 139 are identical - both have Fx1(shiftd). Program 210 adds +6dB to Fx1(shiftd), adds Delay(echod), adds Gain(preamp) but bypasses it, turns on Speaker Simulator (combo1brite), and decreases Post level by 4dB.
EnvFilter EP – Programs 7 and 106 are almost identical – both have Fx1(sweepfilter) but Program 106 removes Fx2(volumem), Delay(delayed), Insert, and Noise Gate. Program 215 adds a +6dB EQ (volume), adds Gain (tone) but bypasses it, turns on Speaker Simulator (combo1brite), and increases Post level by +6dB.
From what I can tell, all programs under ‘Amp Input + FX Loop’ and ‘Amp Input Only’ appear to have Insert bypass off (light on) and Speaker Simulator off. In most cases, same-named programs appear to be identical with some ‘Amp Input + FX Loop’ versions adding a few more effects like Fx2 and Delay.
All programs under 'Stand Alone' appear to have an active Gain block (usually preamp or tone) except program 215 (EnvFilter LP) where the Gain block is active but bypassed (I'm not sure why this is). Insert bypass is always on (light off) and Speaker Simulator is always on. I think what makes Stand Alone programs unique is an active Gain block (usually preamp or tone) which provides clean-boost and power for direct recording and driving amps. Some individual effects may also have added boost as well.
Does all this information sound reasonably correct or am I missing some obvious points that make programs under the 3 major groups unique?