[sdiy] bass pedals? How low is too low?

[MED]

Hey group, I've got tons of newbie questions about a possible future
project:
I'm thinking of hacking the two-octave bass pedals off of my organ and
building a stand-alone Taurus-style device. What kind of input
voltage/resistor ladder should I use to get a 1v/oct response?
Also, I am wondering where the bass range of a VCO stops and a LFO begins.
Obviously a reference I could use is the E1 of a bass guitar, and simply go
to the C that is lower than that. But I *really* like low-frequency bass.
(but not in the range of "can't even hear it but it still sends you
reeling")
So what note should I decide upon as the threshold of hearing? A0? C0?
That's around the 20hz limit... Would, for instance, the ASM-1 oscillator
remain 1v/oct in that area, while still leaving me the option to switch the
oscillator as high as, say, C5 or C6? I assume that I would need a fairly
large charging capacitor. What other things would I have to change/should I
look out for?
(i can imagine this being a pain to tune at such low frequencies.)

In addition to that, what's the lowest note that I could consistently send
through an amplifier and speaker cabinet (possibly also home-built if need
be) at a volume that is audible (and at the best concert-acceptable) and not
completely destroy them due to it looking like DC?
Obviously this is different for tube amps and the various solid-state amps.
Maybe i'll have to do separate amplifiers for the different frequency
ranges. But that comes after I've already got this stuff all figured out.

-MED, who keeps thinking up questions, but it'll wait until after this gets
sorted out...