--- In SergeModular@yahoogroups.com, jan-hinnerk.helms@t... wrote:
the highest DSG frequencies sometimes the feedback loop stops
oscillating. This has always happened on all four of my DSG's, and is
a pain because you have to manually repatch to start the system
oscillating again. You need to do conceptually the same patch but
instead of patching the gate output to the gate input, patch the audio
output through a comparator (NCOM) and back into the gate input...I
forgot the exact patch but I will set it up tonight and post it tomorrow.
Another tip is the DSG input, which is the master oscillator, cannot
have a DC bias, so use the "sine" output of the PCO/NTO or the square
output of the NTO.
Anyway, you can get interesting results though. Another drawback is
the DSG has a max. frequency of around 5000 Hz, ideally you want the
slave oscillator to have a higher range than the master osc.
I would love for my NTO/PCO's to be modded to accept hard sync, to get
around all these problems, and to not require so many modules to
achieve a simple hard sync patch.
--Harvey
> Thanks to Chris, John and Blake for filling me up regarding CVOK... the above approach is NOT the best way to achieve it, because at
> attenuation and CVI details. But as you can imagine, I still have some
> questions left (ah...what a surprise):
>
> According to the catalogue, the NTO and PCO have sync capabilties. As I
> understand it, this is a dedicated "soft sync" input (allowing to
> beating-free lock the sync'ed oscillator's frequency to any
> harmonic/fundamental/sub-harmonic of the syncing oscillator), but it
> does not allow for "hard sync" (resetting the sync'ed oscillator's
> waveform whenever the synching oscillator has a reset, normally the
> rising edge of a square wave is used as the reset signal, see
> http://www.csounds.com/ezine/sync/ for a nice picture of hard sync).
>
> I asked Rex about modifying the NTO/PCO for hard sync. He answered that
>
> > Hard sync is not available on the [PCO] or [NTO] -- you use the 'SIG"
> > input jack(s) on the [DSG]s to perform the operation.
>
> So he refered to the "how to hard-sync using a DSG" section of the STS
> catalogue. In case you don't have it at hand, I'll quote:
>
> [QUOTE]
> Sub-Harmonic Series Generator (Divider). If a series of triggers are
> applied to the TRIG IN jack that are faster than the total rise plus
> fall time, then the unit will divide the incoming triggers by a whole
> number.
> [SNIP]
> If the Slope Generators are set to audio frequencies, and the incoming
> triggers are in the audio range, then the output will be the
> sub-harmonic series. This is similar to the "hard sync" sound found in
> other synthesizers (and is the main reason that it is not included on
> Serge VCO's).
> [UNQUOTE]
>
> When I visited George Miller and his Blue Fun Station, we checked this
> out, result: the sound of the subharmonic series is NOT similar to a
> hard sync sound.
>
the highest DSG frequencies sometimes the feedback loop stops
oscillating. This has always happened on all four of my DSG's, and is
a pain because you have to manually repatch to start the system
oscillating again. You need to do conceptually the same patch but
instead of patching the gate output to the gate input, patch the audio
output through a comparator (NCOM) and back into the gate input...I
forgot the exact patch but I will set it up tonight and post it tomorrow.
Another tip is the DSG input, which is the master oscillator, cannot
have a DC bias, so use the "sine" output of the PCO/NTO or the square
output of the NTO.
Anyway, you can get interesting results though. Another drawback is
the DSG has a max. frequency of around 5000 Hz, ideally you want the
slave oscillator to have a higher range than the master osc.
I would love for my NTO/PCO's to be modded to accept hard sync, to get
around all these problems, and to not require so many modules to
achieve a simple hard sync patch.
--Harvey