1.) The multiplier and divider switches don't seem to do anything. I assume if they are both to the left, it is the same as both to the right. If I have the switches facing inwards or outwards, I don't notice any difference. thoughts?
I'm assuming you mean the phase switches, and not the rotary switches. They flip the phase of the respective signal by 180 degrees. The phase switches for the most part won't make a difference, but you may occasionally find a warble or volume cutout at particular mult/div intervals, in which case the phase will help. It's more obvious when using headphones.
2.) The "Preamp" knob is an input signal booster/ reducer. With different basses, I don't notice much of a difference, but I'm sure drum machines, guitars, synths, etc this knob would be more useful. thoughts?
The preamp gives about 20dB of boost. It's most noticeable when mult/div levels are at minimum so you are only hearing the square wave. Put the trigger at a setting that is "always on" as opposed to gated. The Preamp will then act like a gain for a fuzz pedal. Again, it is subtle, but it seems this was designed for a plethora of signals, so having the boost on hand may be necessary for other sources that perhaps aren't so strong.
3.) "Waveshape" only affects the square wave signal.
False, it is on the output of the PLL, where all three signals have been mixed. It is a fixed passive filter, like a tone control on a passive bass. Again this is super noticeable on headphones, maybe not so much through an amp, as the cutoff frequency is a bit high.
4.) I had a ? on lagtime/ response but don't remember.
5.) The "Loop Speed" switch is critical for super fast and sputtery vs slow and rising/ falling.
Yes, this switches in three different capacitor values for the "release" of the PLL chip.
6.) For the "drone box" I use an expression pedal and find that it's pretty ho hum. I use a hotone bass press. Any other suggestions?
I find a 500k ohm or 1meg ohm potentiometer is ideal, either linear or reverse log. I made a post here on TB before on how to make the box. Bonus points for whoever finds it.