Hey Rasp, welcome!
Very interesting questions. I have an Indigo (b-series) so I don't have the Moog filters (grrr), but the Indigo can do all the other stuff you mention.
Pure-tuning: I'm always swapping between settings (pure, natural, or temp), as it depends on the patch. I think it's a great shame that the parameter is a "global" setting as opposed to a local one that you can save with the patch itself, but I think there may possibly be memory size issues that forced that implementation. (Having a local puretuning parameter for each patch would add additional bits/bytes to the patch, which cumulatively...).
In the main I tend to keep it on the Natural (middle) or Temp setting, but Pure is handy for polyphonic patches that use a lot of distortion or resonance, and Temp is great for injecting slight free-flowing randomness to mellow patches to make them less sterile.
Analog boost: I tend to whack up the intensity to full, and then sweep the frequency until it complements the patch, then I reduce the intensity. I've no idea about the techicalities of it (such as whether it's a standard semi-parametric EQ, or if anything else is happening). Generally I don't tend to have the intensity too high though, or it has a tendency to sound a bit muddy.
Punch: Very effective! Even Korg has copied this feature for their Radias. It works in a psycho-acoustic way. The simple pop gives the impression that the patch is louder or more powerful, great for percussive or bright stuff. Obviously useless for anything with a slightly longer attack.
I believe it's a single-cycle pulse-wave. That's how Korg described theirs, and looking at the waveforms it works similarly.
Mod routings I'm always using the usual amp and filter env to velocity, and the LFOs for subtle tuning or filtering or PWM. I also like to play around with the ADSR timings depending on velocity, a common one being to subtly extend the amplifer/filter release or decay time the harder a key is pressed. Random gets used a lot, for subtle PWM, panning, chorus, or envelope amounts etc so it sounds different every time you hit the keys. Occasionally I'll have a little FM amount to velocity with Osc2 oscillator-sync'd to Osc1 for more aggressive stuff. I usually reserve Knob #1 to control two or more parameters at the same time for obscene/crazy stuff using the matrix. Knob #2 I usually leave as is for effects wetness. The mod wheel usually gets used for the standard filter cutoff, adding noise, phaser/chorus depth, or unison detune. Nothing out of the ordinary.
MoogFilters. I soooo wish my Indigo v1 had this capability, as the 1-pole sounded evil on [
Ben Crosland's OS v6.5 video (7mb wmv)] from Namm a few years back.
Cheers
