Re: [AH] mixers (was Re: ARP 2600 vs modular?)

From James Husted
Sent Sat, Dec 6th 2008, 02:09

There is a tread on the Doepfer Yahoo list about matrix mixers. There  
are a few out there and a few in the works coming soon (Goepfer and  
Harvestman). There is a nice PCB layout based on the Buchla 205 matrix  
mixer on the Electro-music DIY board too. Just do a Google for matrix  
mixer and you will get a few hits for sure. Some of the new designs do  
inversion too, as in full CCW full inverted, mid position off, full CW  
full positive signal. Very nice.

-James


On Dec 5, 2008, at 3:31 PM, John Mahoney wrote:

> -----Original Message-----
>> From: Mark Landman <redacted@example.com>
>>
>> The 2600 does have the benefits of portability, normalled  
>> connections,
>> speakers, and such, but one overlooked feature of the Arp design is
>> the relatively generous amount of audio and control voltage mixers
>> built into each module.
>>
>> These make the machine even more playable, and encourage
>> experimentation. You could duplicate this in a modular with lots of
>> mixer modules strategically located throughout, but it's just not the
>> same.  [snip]
>
> Good points. The Roland system that is used to illustrate Roland  
> "The Synthesizer" books -- the old set of 4 books -- is pretty cool  
> in that regard. Is it the System 100? Like the ARP 2600, it uses  
> sliders (but very small ones) and has normalled connections. There  
> are mixers all over the place. This is a Very Good Thing!
>
> Matrix mixers, which you mentioned, can be used to derive complex  
> signals from a few inputs. Lots of potential, there, and it's odd  
> that you don't see more of them. David Tutor was doing matrix mixing  
> in the 1960s, if I remember my history correctly, so they are hardly  
> a new concept. They aren't even complicated, electronically! I hope  
> to add a DIY matrix mixer to my modular.
>
> John