MOTM

>as some of you may know from my recent posts i just completed my 420 
>filter. i really likr the way it sounds but had some questions about 
>a few things. i have a mostly roland setup analog wise and plan on 
>using my mc202 and sh101 to trigger this thing. do i have to send it 
>a gate signal or would a trigger from an 808 or 909 work as well? i 
>also have access to a juno6 but dont know if i can do anything with 
>that and havent tried. paul said the cv changes the resonance 
>setting, will a trigger signal change this to the new value 
>instantaneously or can i get a gradual change? how do you guys like 
>to use your 420 filter?

You can change the filter frequency with a CV, not the resonance, on 
the 420. You wouldn't normally put a trigger or gate into the FM1/FM2 
jacks because they will change the filter frequency abruptly between 
two frequencies (gate low and gate high). Although that could be 
useful in its own right. I often plug an envelope generator output 
into the FM1/FM2 jacks on the 420, or an LFO output, or a sample & 
hold.

On Tuesday 28 September 2004 05:35, Wood wrote:
> as some of you may know from my recent posts i just
> completed my 420 filter. i really likr the way it sounds
> but had some questions about a few things. i have a
> mostly roland setup analog wise and plan on using my
> mc202 and sh101 to trigger this thing. do i have to send
> it a gate signal or would a trigger from an 808 or 909
> work as well?

It depends on how you want to process the audio of your 
roland synths. You can simply route the synth through the 
filter and set the '420 frequency and reso pots to some 
value and that's it. It *will* change the sound, but it's 
sort of static.

You get a more exiting sound if you can get the filter's 
sound to change at each new note you play on your synth. 
You normally use an envelope generator for that, like the 
MOTM-800 EG. You feed the EG the gate or trigger signal, 
and connect the output of the EG to the FM input of your 
420. Now every time the EG gets triggered, the filter can 
be opened and close in some fashion. That's when you get 
the classic synth effect. And I can tell you that the '420 
is great for that stuff!

- Robert

Hi Eric,
Congrats on finishing your first kit.  I have a similar setup as you 
(808 & 101) with the 420 being my only filter at the moment  There 
are some neat things you can do with it, despite it being your only 
module.  The most obvious thing to do with the 420 would be to 
filter audio from your drum machines, synths, and what ever other 
equipment you may have.  You can also use the 420 during mix down as 
low pass or hi pass filter to remove unwanted frequencies.

You can do some other stuff by turning the resonance up all the way 
to make the filter self oscillate.  First of all, you can play 
melodies with the oscillating filter by sending CV out from your 101 
or 202 into the 1V/OCT input on the 420.  The problem is you don't 
have a VCA to control amplitude, so you will continue to hear the 
filter self oscillate even when you have released a key.

Try turning the 420's resonance up, so the filter oscillates.  Now 
dial the resonance back just a hair so it stops.  You want the 
filter on the verge of oscillating.  Now take a trigger out from 
your 808 and plug it into the FM input #1.  The trigger will excite 
the filter into oscillation and it will decay naturally if you have 
the resonance set right.  Experiment with the FM input going from 
negative to postive and you will see it has an impact on the attack 
of the sound.  The frequency control will change the pitch of the 
sound.  You can get anything from kick drums, toms, pings and plinks.
You've got a very basic percussive voice here that can be triggered 
in time with your 808.

Finally make the 420 oscillate and try plugging the output of the 
420 into the modulation grip input on your SH-101.  You can use the 
420 to modulate the 101's VCO's pitch or the VCF's cutoff 
frequency.  The smaller sliders in the bender section will control 
how much of the CV generated by the 420 reaches the 101's VCO and 
VCF.  You've now got an extra modulator to work with in the 101.  
Try increasing the frequency of the 420 filter into the audio range 
for some cool fx the 101's LFO can't pull off.

I hope this helps you out.. remember to be careful when using the 
420 as an oscillator because it is possible to blast your ears or 
speakers.
-Jim

--- In motm@yahoogroups.com, "Wood" <buck75@e...> wrote:
> as some of you may know from my recent posts i just completed my 
420 filter. i really likr the way it sounds but had some questions 
about a few things. i have a mostly roland setup analog wise and 
plan on using my mc202 and sh101 to trigger this thing. do i have to 
send it a gate signal or would a trigger from an 808 or 909 work as 
well? i also have access to a juno6 but dont know if i can do 
anything with that and havent tried. paul said the cv changes the 
resonance setting, will a trigger signal change this to the new 
value instantaneously or can i get a gradual change? how do you guys 
like to use your 420 filter?