MOTM

I describe the patch briefly on my website, but here's more detail.  I 
recreated this patch about a month ago, too, with some success.  (I 
document my patches on large sheets of graph paper, tossed into a pile, 
and I dug that one out.  I have it in front of me now.)  The Cross 
Product patch uses:  2 MOTM-310, MOTM-120, MOTM-410 with OMS-410, 
MOTM-440, MOTM-390, triple S&H (2 Oakley + MOTM -101), MOTM-820.  It's 
straight-forward, both in the audio and the control paths, with no 
feedback anywhere.  The 310s go to the 120 inputs (A, B) and from the 
120 mix output in parallel through the two filters.   The final audio is 
a mix of two 410 outputs: 1 (left) and 3 (right), and the 440 (center).  
The three sample and holds drive it all.  The Oakleys are both clocked 
by one 390 square wave, each on the opposite clock polarity.  The first 
S&H out cascades to the second S&H input (in addition to the 820 
input).  The slew limiting feature of the Oakley S&H modules plays an 
important part in keeping the pitches from varying too far on each clock 
cycle.  The first S&H goes through the 820 lag processor to one 310 VCO 
1V/Oct input.  The second S&H uses no lag to the second VCO.  Since the 
VCOs are tuned in unison to start (or almost -- I think there is a 
slight beat), and since the dual S&H cascades the first voltage to the 
second VCO, the result is that on each new clock they diverge in 
frequency and then gradually converge again on the second half of the 
clock cycle, often as lag ends.  This would not be so interesting, if it 
weren't for the cross-product mixing.  The MOTM-101 is internally 
clocked.  It controls the both the 820 lag rate and the 410 internal LFO 
rates.  The 440 FM is correlated with the 410 frequencies by means of 
one of the internal LFOs brought out through the Oakley OMS-410 
companion module.  That is it.  Not a big patch.  The devil is in the 
knob tweaking.  There is a good deal of movement control to be done 
here, but it always retains the character of the MOTM-120 in 
cross-product mode and the sound of the two MOTM filters.

Richard
http://www.pugix.com

Mike Marsh wrote:
> Nice!  Can you describe the patch?
>
> Mike
>
> --- In motm@yahoogroups.com, Richard Brewster <pugix@...> wrote:
>   
>> To save time, I put up the full MP3 on my website.  It's 'only' 13MB 
>> (about 10 minutes long).
>>
>> http://www.pugix.com/music-samples.htm
>>
>> If you don't see Cross Product, hit your browser refresh button.
>>
>> Richard
>>
>> Mike Marsh wrote:
>>     
>>> Hey Richard -
>>>
>>> Maybe you could make an exerpt of the piece and MP3 it (ugh) and put
>>> it up in the files section.  I'd love to hear it!
>>>
>>> Mike
>>>
>>> --- In motm@yahoogroups.com, Richard Brewster <pugix@> wrote:
>>>   
>>>       
>>>> I of course have the MOTM-120R panel with the daughterboard and 
>>>> additional outputs.  But you don't need those modifications to get 
>>>> something quite unique, which is the *cross-product modulation*.
>>>>         
>  The 
>   
>>>> original idea came from Electronotes.  Paul Schreiber simplified the 
>>>> circuit and made it easy to use in the 120.  I did a really neat
>>>>         
> piece 
>   
>>>> with two MOTM-310 VCOs into the 120 in cross-product mode.  It is
>>>>         
> long, 
>   
>>>> which is why I don't have it on my website.  But I intend to be
>>>>     
>>>>         
>>> updating 
>>>   
>>>       
>>>> my site with a lot more pictures and more music samples,
>>>>         
> including ones 
>   
>>>> that demonstrate special modules like the 120.  I will make a
>>>>         
> shortened 
>   
>>>> MP3 of that piece.
>>>>
>>>> Again, it's the cross-product mode that makes the 120 unique, at
>>>>         
> least 
>   
>>>> for me.  And with the DC coupled output on the modified version,
>>>>         
> I use 
>   
>>>> it as a sequencer of sorts, too.  That is all in addition to the
>>>>         
> main 
>   
>>>> feature of sub-octave generation.
>>>>
>>>> Richard Brewster
>>>> http://www.pugix.com
>>>>
>>>> Adam Schabtach wrote:
>>>>     
>>>>         
>>>>>> Good audio of the MOTM-120 in action.
>>>>>>     
>>>>>>         
>>>>>>             
>>>>> Speaking of the 120, this is a module that isn't in my system and
>>>>>       
>>>>>           
>>> is on the
>>>   
>>>       
>>>>> to-be-discontinued list. Does anyone have any samples of this unit
>>>>>       
>>>>>           
>>> online? I
>>>   
>>>       
>>>>> find the ones on the MOTM site to be, uh, uncompelling, but the
>>>>>       
>>>>>           
>>> module seems
>>>   
>>>       
>>>>> interesting from a theoretical standpoint. Are there any 120
>>>>>       
>>>>>           
>>> owners who
>>>   
>>>       
>>>>> would like to show me what I'm missing?
>>>>>
>>>>> Thanks--
>>>>> --Adam
>>>>>
>>>>>
>>>>>
>>>>>  
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