[sdiy] Modular patching rules

[Steffen]

On 10/02/2007, at 22.53, Tim Parkhurst wrote:

> the "standards" for modular synth gear are:
> 100K input impedance
> 1K output impedance
> +/-5V Audio levels
> 0 to +5V control signals (0 to +10V in some cases)

Does 100K input impedance mean that there need to be a 100K Ohm  
resistor at every CV in? And likewise, a 1K Ohm at every output? I'm  
asking since
1) the word "impedance" make my nervous; I'd don't really understand  
it's meaning in the electronics context.
2) i'm working on a module that have 49.9K Ohm resistors to every CV  
in. Will simply chancing them to 100K Ohm likely make the design tilt?


I maybe should post this in a fresh thread. But while I'm at it: My  
scope is quite slow, more then 4kHz signals is out of it bunch. But i  
could let my computer act as an aprox. freq. counter. To do that -  
and in general to feed the synth sound to a mixer outside the system  
- I need to make the +/-5V signal into a line signal, which is 1Vpp,  
right? Any pointers to such "converter"?