Regarding 1v/Oct; hoping I understand your question correctly, my layman's explanation of the volt/sound relationship is that in order to double the pitch of your oscillator (shift up an octave), the controlling voltage needs to increase by 1V. This is, of course, provided you use a proper 1v/Oct source such as MIDI->CV, TKB CV outs.. obviously nothing's preventing you from using differently calibrated sources (AC or DC coupled in SERGE speak) to obtain other results.
On 2010-09-10, at 5:00 AM, roelelec wrote:Hi Yulian,
Thanks for your welcome input!
Your example is very clear, I understand it perfectly. I will try this. To get a better picture and sound picture of AC and DC coupling.
Are different couplings of waveform outs of an oscillator uniquely Serge? Or is this common practize among other brands as well?
One question still begs for an answer: why is it then not important if in/out's are DC or AC coupled when they produce signals in the audio region? When we take your example of the VCA again. When we audio rate modulate that with an osc we get amplitude modulation at 20 hz or higher. Does this mean that amplitude modulation sounds practically the same with DC and AC coupled audio signals?
Let's try this too! Meaby were still in for a nice suprise.
Absolutely, when Rex mentions something, it's always significant.
And coming back to volt and hz. I now understand that volt and hz are part of two different worlds; you can't bring them together.
Hertz is correlated to sound, cause frequency is the number of cycles per second which is expressed in hertz. And within the range of 20 hz - appr. 18 khz we can hear this as sound.
But what about volt? I want to understand this musically. Say a signal raises another signal by +5 volt, the output of this modulation we can hear soundwise. So there must be a link between voltage and sound, like there is between hertz and sound!
Can someone explain this?
Cheers,
Roel
--- In SergeModular@yahoogroups.com, BooleanYulian <a.b@...> wrote:
>
> Hi..
>
> As per my understanding of things following Rex's explanation, it is very important to differentiate AC and DC-coupled ins/outs (in SERGE speak) when the signal is used for modulation, but not so important when the signal is used for audio. This is mainly apparent when modulating the level of a VCA when used to control audio levels; if the said VCA's (say a UAP) level is set to unity gain (no attenuation and no gain; level in = level out) and you use an AC coupled LFO (SIN out from PCO) to modulate that level, the result would be a change in level alternating from less-than-unity-gain (aka attenuation) to more-than-unity-gain (aka gain or level boost) centred around the preset level (in this case, unity gain). If a DC coupled LFO (TRI or SAW out from the same PCO as above) is used, then the resulting change in level will alternate between the preset level (here, unity gain) and more-than-unity-gain. This is supposed to be not much of an issue when we look at AC or DC coupled audio signals. Probably a good way to check is to patch a DSG to cycle and dial it into the audio range, then do an A/B comparison between it's AC and DC coupled outputs.
>
> I was faced with a similar dilemma when buying the Matrix Mixer m-odule; had to choose between the AC or DC coupled version
>
> As far as Bakis' mention of new and/or upcoming m-odules; this is would be done with Rex's consent or by his request and I think he'd be pretty adamant that the product description be posted word for word as per his text.. and we all know how detail oriented and meticulous Rex is. That being said, if the given STS product sports AC and/or DC coupled jacks, it would make sense that it'd be mentioned.
>
> Hope this helps, I apologize if I've repeated anything that's already been said on the thread and I definitely welcome corrections :)
>
> cheers
> Yulian
>
> On 2010-09-09, at 4:50 AM, roelelec wrote:
>
> > But I think on the Serge it's even more important cause of the different approach, structure-wise Therepnin took. If it really didn't matter if a signal in a Serge is audio or cv, why would the Gold book go to great length to explain it all in detail. That's why it's so invaluable to the Serge musician. BTW when Bakis announced a new module, he mentioned if it was AC or DC coupled. He wouldn't do that it was only in the interest of theory goers.
>