Synth-DIY Yahoo! Groups Archives

Thread

QTKB & ASR problem

2007-07-17 by johnrichoux

Hi folks

I've just begun using a QTKB and am getting interesting but unexpected results with an ASR.
Does the ASR have trouble sampling quantized CV?

A simple two note sequence seems to set a minimum and maximum and adds random notes
in-between. I have the attenuator fully on. Decreasing it reduces the max-freq.

The TKB and ASR are both clocked by the same DTG. I've varied the rise & fall times thinking
that might be the problem, but still the same.

If I bypass the quantizer, the ASR behaves as I would expect. CV's are sampled, delayed and
reproduced as recorded.

Any suggestions would be appreciated.

Thanks
John R.

Re: QTKB & ASR problem

2007-07-18 by metafoetus2002

Hi John,

from reading your post it looks like the voltage goes from the QTKB into the ASR. IMHO it
makes more sense to have the quantizer as the last link in the chain. This means to
"sacrifice" more of the QTKB channels for quantizing the individual ASR outs, but it should
ensure "correct" notes.

Best regards,
Jan-Hinnerk

Show quoted textHide quoted text

--- In SergeModular@yahoogroups.com, "johnrichoux" <jrichoux@...> wrote:
>
> Hi folks
>
> I've just begun using a QTKB and am getting interesting but unexpected results with an
ASR.
> Does the ASR have trouble sampling quantized CV?
>
> A simple two note sequence seems to set a minimum and maximum and adds random
notes
> in-between. I have the attenuator fully on. Decreasing it reduces the max-freq.
>
> The TKB and ASR are both clocked by the same DTG. I've varied the rise & fall times
thinking
> that might be the problem, but still the same.
>
> If I bypass the quantizer, the ASR behaves as I would expect. CV's are sampled, delayed
and
> reproduced as recorded.
>
> Any suggestions would be appreciated.
>
> Thanks
> John R.
>

Re: QTKB & ASR problem

2007-07-18 by johnrichoux

Sounds like it might work; I'll give it a try and report back.
Thanks
John R.

--- In SergeModular@yahoogroups.com, "metafoetus2002" <jan-hinnerk.helms@...>
wrote:

Show quoted textHide quoted text

>
> Hi John,
>
> from reading your post it looks like the voltage goes from the QTKB into the ASR. IMHO

> makes more sense to have the quantizer as the last link in the chain. This means to
> "sacrifice" more of the QTKB channels for quantizing the individual ASR outs, but it

should

> ensure "correct" notes.
>
> Best regards,
> Jan-Hinnerk
>
> --- In SergeModular@yahoogroups.com, "johnrichoux" <jrichoux@> wrote:
> >
> > Hi folks
> >
> > I've just begun using a QTKB and am getting interesting but unexpected results with

> ASR.
> > Does the ASR have trouble sampling quantized CV?
> >
> > A simple two note sequence seems to set a minimum and maximum and adds random
> notes
> > in-between. I have the attenuator fully on. Decreasing it reduces the max-freq.
> >
> > The TKB and ASR are both clocked by the same DTG. I've varied the rise & fall times
> thinking
> > that might be the problem, but still the same.
> >
> > If I bypass the quantizer, the ASR behaves as I would expect. CV's are sampled,

delayed

> and
> > reproduced as recorded.
> >
> > Any suggestions would be appreciated.
> >
> > Thanks
> > John R.
> >
>

Re: QTKB & ASR problem

2007-07-19 by johnrichoux

Hello Jan-H

I tested your suggestion and it works, thanks.

I think I know why my first approach didn't work. I was triggering the sequencer and the
ASR from the same source. So, the ASR was sampling before the quantization was
complete (most of the time). So, I used a 2nd DTG with a little wider gate time for the ASR,
and it works just fine. By varying the gate time I can introduce fewer or more quantization
errors, which can be very interesting. (Serge+interesting=fun!)

So, now I can do either approach. One requires more QTKB channels, the other requires
another clock source.

Thanks again
John R.

--- In SergeModular@yahoogroups.com, "metafoetus2002" <jan-hinnerk.helms@...>
wrote:

Show quoted textHide quoted text

>
> Hi John,
>
> from reading your post it looks like the voltage goes from the QTKB into the ASR. IMHO

> makes more sense to have the quantizer as the last link in the chain. This means to
> "sacrifice" more of the QTKB channels for quantizing the individual ASR outs, but it

should

> ensure "correct" notes.
>
> Best regards,
> Jan-Hinnerk
>
> --- In SergeModular@yahoogroups.com, "johnrichoux" <jrichoux@> wrote:
> >
> > Hi folks
> >
> > I've just begun using a QTKB and am getting interesting but unexpected results with

> ASR.
> > Does the ASR have trouble sampling quantized CV?
> >
> > A simple two note sequence seems to set a minimum and maximum and adds random
> notes
> > in-between. I have the attenuator fully on. Decreasing it reduces the max-freq.
> >
> > The TKB and ASR are both clocked by the same DTG. I've varied the rise & fall times
> thinking
> > that might be the problem, but still the same.
> >
> > If I bypass the quantizer, the ASR behaves as I would expect. CV's are sampled,

delayed

> and
> > reproduced as recorded.
> >
> > Any suggestions would be appreciated.
> >
> > Thanks
> > John R.
> >
>