Re: [AH] analog modular w/ d-g-t-l CV's

From Guy D2
Sent Sun, Jul 27th 2008, 15:54

Andrew, thanks for the info. I wasn't aware of the PSIM-1.
It looks pretty close to what I had in mind, yes. A bit outdated
(mainly in UI execution) by now, and somewhat "too technical
in its approach" - to my liking at least, but close, yes.

How is the aliasing at very low frequencies ?

I'll look up the Yahoo group. Thanks again.

Can you explain me why this is a "sore point for many people out  
there" ?
Because it's digital ?


On 27 Jul 2008, at 05:32, Andrew Scheidler wrote:

> I know it's a sore point for many people out there, but the PSIM-1 is
> exactly what you're talking about.  I was looking for this same thing
> right about when the first batch of PSIMs were made, and thanks to my
> flood of questions and comments to the builder, I ended up with the
> sixth one made.  Things got very messy after that, with people waiting
> a long time for their (pre-paid for) PSIM.  Some are still waiting.
> All that aside, the module is cool as hell.  It is basically a Atom
> processor inside, and 4 input jacks, 4 output jacks and a few buttons
> on the outside.  There is a seriel port for a computer hook-up, and
> you write the software in a version of compiled BASIC.  So you're only
> limited by your imagination (and your programming skills).
> While you can use it as an LFO or an envelope generator, there are far
> better uses for it.  My favorite programs are quantizers, sequencers
> and other "CV processor"-type things.  The CPU isn't fast enough to do
> high quality audio things, but it will try...  I made a program that
> takes audio and reduces it to four bits, then outputs the four bits
> (basically very fast gates) at the four output jacks.  Mix these back
> together and you get some pretty gnarly stuff  :)
> There is a Yahoo group (Control Voltage Sources, IIRC) that is
> building a "new PSIM" module.  If you're interested in this type of
> module and are into DIY, you should definitely check out that group.
> Drew
> On 7/25/08, Matthew Davidson <> wrote:
>> On Jul 25, 2008, at 3:46 PM, Guy D2 wrote:
>>> Is there a particular reason why the current crop of modulars is  
>>> not using
>> digitally generated CV's for control modules like LFO's, EG's, S/ 
>> H's and
>> similar ?
>> There are plenty of hybrid designs if you look around.
>> The Doepfer MCV24 has software ADSRs and LFOs that can be output as  
>> CV
>> The Buchla 200e is an extreme hybrid approach, freely converting  
>> analog to
>> digital and back again. The elements exposed to the user is  
>> primarily analog
>> (patch cords and such).
>> mfb has some designs like the osc-01 that are digital inside, but  
>> use analog
>> CV interfacing
>> The Blacet/Wiard Miniwave is mostly digital inside, with analog CV
>> interfacing
>> Plan B is producing some hybrid modules.
>> The AS RS370 polyphonic osc is mainly digital, but with CV  
>> interfacing
>> Simple circuits like LFOs and S&H's are possibly easier/still cost  
>> effective
>> to remain analog as a primary module. I haven't fallen in love with a
>> digital envelope, ever, personally. This is something that is just  
>> more
>> effective as analog for short transients.
>> But, I do see hybrid designs as a solid future direction for  
>> modulars. I
>> wouldn't mind seeing a digital module for generic slow control  
>> voltages,
>> like LFOs and S&H CVs, etc.. You might be able to pack eight  
>> outputs of
>> programmable voltage thingies in a cost-effective unit. It might  
>> also be
>> easier to create an complex arbitrary break point function in the  
>> digital
>> domain.