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K5 through Analog Filters

K5 through Analog Filters

2005-11-01 by nelsonj_sce

I recently got a Roland MKS70 and figured out how to mod it so I can 
run (6) external signals through its filters/VCA/Chorus.  I am 
running the four outputs of the K5 through the MKS70 with the MKS70 
in "mono mode" (Guitar synth mode).  By filtering the K5 midi output 
through my computer and MidiOX, I can send different parts of the K5 
keyboard to different midi channels, and then on to the filter of my 
choice in the MSK70.    

The result: Different notes on the K5 trigger their own filters.  It 
is a true 4-voice poly board.  If I trigger more than four voices, 
several notes go through the same filter in a paraphonic (?) mode.

In my opinion it sounds fantastic!!!  Just think about it, the K5 
additive OSCs, stacked into multi layers, and then run through  the 
very decent ANALOG filters/VCA (and Chorus)of the MSK70 (filters are 
24db with Resonance and self-oscillation).  I can also add 2 
additional DCOs (square/pulse/saw/noise) from the MKS70 - this helps 
add some much needed low end to the K5, or whatever else I want (like 
noise).  Think PPG 2.3 and a very rich sound.  The analog filters 
just add so much life and beef to the K5 - I love it!

I will try to record some MP3 (K5 solo, K5 with DCOs, K5 with 
DCOs+Filters, K5 with DCOs+Filters+Chorus).  Note that I upgraderthe 
op-amps in my K5 to Burr/Brown, did the 147k resistor mod,and this 
helps out also, but the filters are what really does the trick.

I am in love with the sound and have spent hours and hours playing 
with the K5 through the MKS70.  My BCR2000 is programed to control 
all the MKS70 settings so tweaking is very easy. 

I hope to post some sounds in a week or so.  Stay tuned...

Re: [k5synth] K5 through Analog Filters

2005-11-01 by Antoine Deschênes

Yeah, about your OPA4134 mod, I don't remember if you told the 
improvement was big or small.

Since the free samples I've got from TI are SMD, I will have to build an 
adapter. It's harder to solder, but I could put some filtering 
components on the adapter board. Yay!

Also, something interesting to build would be one of the uCapps.de 
(MIDIBox) projects and control some filters with it. I wonder what a 
Moog filter on a K5 sounds??

nelsonj_sce a \ufffdcrit :
Show quoted textHide quoted text
>I recently got a Roland MKS70 and figured out how to mod it so I can 
>run (6) external signals through its filters/VCA/Chorus.  I am 
>running the four outputs of the K5 through the MKS70 with the MKS70 
>in "mono mode" (Guitar synth mode).  By filtering the K5 midi output 
>through my computer and MidiOX, I can send different parts of the K5 
>keyboard to different midi channels, and then on to the filter of my 
>choice in the MSK70.    
>
>The result: Different notes on the K5 trigger their own filters.  It 
>is a true 4-voice poly board.  If I trigger more than four voices, 
>several notes go through the same filter in a paraphonic (?) mode.
>
>In my opinion it sounds fantastic!!!  Just think about it, the K5 
>additive OSCs, stacked into multi layers, and then run through  the 
>very decent ANALOG filters/VCA (and Chorus)of the MSK70 (filters are 
>24db with Resonance and self-oscillation).  I can also add 2 
>additional DCOs (square/pulse/saw/noise) from the MKS70 - this helps 
>add some much needed low end to the K5, or whatever else I want (like 
>noise).  Think PPG 2.3 and a very rich sound.  The analog filters 
>just add so much life and beef to the K5 - I love it!
>
>I will try to record some MP3 (K5 solo, K5 with DCOs, K5 with 
>DCOs+Filters, K5 with DCOs+Filters+Chorus).  Note that I upgraderthe 
>op-amps in my K5 to Burr/Brown, did the 147k resistor mod,and this 
>helps out also, but the filters are what really does the trick.
>
>I am in love with the sound and have spent hours and hours playing 
>with the K5 through the MKS70.  My BCR2000 is programed to control 
>all the MKS70 settings so tweaking is very easy. 
>
>I hope to post some sounds in a week or so.  Stay tuned...  
>  
>

Re: K5 through Analog Filters

2005-11-01 by nelsonj_sce

My BB opamps did help a lot, but there is still noise.  You will be
able to add filters, that is interesting.  Please tell us how it goes.
PM if you need any help with the schematics. 


--- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@y...> wrote:
>
> Yeah, about your OPA4134 mod, I don't remember if you told the 
> improvement was big or small.
> 
> Since the free samples I've got from TI are SMD, I will have to
build an 
Show quoted textHide quoted text
> adapter. It's harder to solder, but I could put some filtering 
> components on the adapter board. Yay!
> 
> Also, something interesting to build would be one of the uCapps.de 
> (MIDIBox) projects and control some filters with it. I wonder what a 
> Moog filter on a K5 sounds??
> 
> nelsonj_sce a écrit :
> 
> >I recently got a Roland MKS70 and figured out how to mod it so I can 
> >run (6) external signals through its filters/VCA/Chorus.  I am 
> >running the four outputs of the K5 through the MKS70 with the MKS70 
> >in "mono mode" (Guitar synth mode).  By filtering the K5 midi output 
> >through my computer and MidiOX, I can send different parts of the K5 
> >keyboard to different midi channels, and then on to the filter of my 
> >choice in the MSK70.    
> >
> >The result: Different notes on the K5 trigger their own filters.  It 
> >is a true 4-voice poly board.  If I trigger more than four voices, 
> >several notes go through the same filter in a paraphonic (?) mode.
> >
> >In my opinion it sounds fantastic!!!  Just think about it, the K5 
> >additive OSCs, stacked into multi layers, and then run through  the 
> >very decent ANALOG filters/VCA (and Chorus)of the MSK70 (filters are 
> >24db with Resonance and self-oscillation).  I can also add 2 
> >additional DCOs (square/pulse/saw/noise) from the MKS70 - this helps 
> >add some much needed low end to the K5, or whatever else I want (like 
> >noise).  Think PPG 2.3 and a very rich sound.  The analog filters 
> >just add so much life and beef to the K5 - I love it!
> >
> >I will try to record some MP3 (K5 solo, K5 with DCOs, K5 with 
> >DCOs+Filters, K5 with DCOs+Filters+Chorus).  Note that I upgraderthe 
> >op-amps in my K5 to Burr/Brown, did the 147k resistor mod,and this 
> >helps out also, but the filters are what really does the trick.
> >
> >I am in love with the sound and have spent hours and hours playing 
> >with the K5 through the MKS70.  My BCR2000 is programed to control 
> >all the MKS70 settings so tweaking is very easy. 
> >
> >I hope to post some sounds in a week or so.  Stay tuned...  
> >  
> >
>

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