Doepfer

Apologies - I think there's been a misunderstanding.

I'm trying to achieve the 'wooden block' sound as popularised by
Buchla synths.

I am using a resonant band-pass filter, and want to send a very short
'trigger' event to the filter's audio in. I have so far tried:

1) sending a short ADSR to the filter. The ADSR is not fast enough,
resulting in a 'tonnngg' rather than a 'tok' sound.
2) sending a signal straight from the midi-cv gate to the filter. The
problem here is that a signal is generated both on a press and release
of a key. As far as I am aware, this is because a gate represents a
shift from positive to negative, OR the reverse. 

What I want is a 'trigger' -  a very short square wave which occurs
only on key press.

Is that clearer? I do *not* need two triggers!



--- In Doepfer_a100@yahoogroups.com, Florian Anwander <fanwander@...>
wrote:
>
> Hi madrayken
> 
> > In trying to pursue this Buchla-style experiment, I've found it almost
> > impossible to derive a decent audio-trigger from an ADSR envelope, no
> > matter how fast. 
> I am not sure what you are asking for. What do you mean with 
> "audio-trigger"?? A trigger signal generated as soon as the level of 
> some audio signal is higher than a certain threshold (thats what I
would 
> understand)? Or do you mean an spike like the "klick"-sound from a
drumpad?
> 
> 
> > Gates work nicely, but you're forced to have two
> > events: one on key-press and one on release.
> This sentence i don't understand.
> 
> > I've got plenty of ADSRs, VCAs, Comparators and other things, and have
> > tried using the voltage comparator to create a gate from an ADSR
> > (close but no cigar). Can anyone suggest a way of generating a
trigger?
> I think you have a wrong understanding of the word "trigger".
> - A trigger defines a point on the time axis and is usually technically 
> achieved by a transition between two defined voltages. It defines the 
> moment when a event starts to happen.
> - A gate defines the duration of an event and starting point of this 
> event. You may describe a gate as two triggers: one positive transition 
> at the start of the gate and one negative transition at the end of
the gate.
> 
> Taking this definition is respect, I am asking: for what patch exactly 
> do you need two triggers? Knowing your answer to this question I might 
> give you a more profound help.
> 
> Florian
>