MOTM

> 
> I was talking to Jeff about the 420 and the Frostwave a couple weeks ago - I
> think having 2 420s would be really cool because you could run them in
> parallel as well as serially, you can run through just a single LPF or a HPF
> if you want (w/ a real MS-20 or a Resonator you've got to run serially first
> through the HPF and then through the LPF).  2 420 are $338-458 depending on
> if you buy the kit or assembled versions.

As John described, it would be nice to have the functionality of 2 420's
(I opt out here since I don't have a 420 but do have an MS20, and
another part of my reluctance to purchase a 420 is that I've not found
notch filters all that useful).

As an alternative would it be possible to mod the 420 with a switch (and
whatever else necessary) to run the signal into the HPF and then into the
LPF when the 420 Mode switch is  set to HPF?  One would still have one
freq and one resonance pot, however.

[Or is this just another one of my dumb questions/comments?]
Jeff

Chaining a 420 into a 440 - now that's a neat idea.  (Maybe I'll have to
rethink my 420 opinion.)
Jeff

on Friday, August 24, 2001 11:12 AM Jeffrey Pontius <jpont@...> wrote:


> Chaining a 420 into a 440 - now that's a neat idea.  (Maybe I'll have to
> rethink my 420 opinion.)
> Jeff

I have found this scenario to work reasonably well, although it doesn't
sound like two 420s.  The 440s LP slope somewhat limits the "character" of
the 420 to come through, however, the VC resonance really adds additional
expressiveness.  I like this setup with the notch filter engaged on the 420
with the resonance set high - it adds more flavor to the sound of the 440.

Now, it would be simply *awesome* if there was a mod to the 420 to allow for
VC resonance!

George

>Now, it would be simply *awesome* if there was a mod to the 420 to allow
>>for VC resonance!

From looking inside my Frostwave, it looks like the VC resonance is
accomplished with an LED/LDR combo.  You can actually see the light change
with the incoming voltage.

> > Chaining a 420 into a 440 - now that's a neat idea.  (Maybe I'll have to
> > rethink my 420 opinion.)

If you want to emulate a SH-5 filter configuration (which is pretty
impressive
IMO), that would be 420 in HP mode without resonance into 440, and parallel
to this chain, a SEM-style filter (does it have a number yet?) in BPF mode.
420 and 440's CVs linked together, and SEM BPF manual only (;->)
(Not a 100% emulation, of course, similar.)

JH.