Doepfer

I have 3 A-190-2's chained - and I've noticed that when
playing chords, the notes on the second and third 190-2
are occasionally incorrect. Sometimes it just flips to the
first note. The 190-2 is receiving correctly - the 'learn'
light flashes on, and the notes trigger (ADSR, etc), but
the pitch is out.

I've stripped my system back to just A-190-2's and A111-5
(voice module), and each 'voice' is on its own separate
bus.

The effect is actually quite pleasing, but it would be nice
to get it working right. Putting together a polysynth is 
quite tricky :)

Ian.

> I have 3 A-190-2's chained - and I've noticed that when
> playing chords, the notes on the second and third 190-2
> are occasionally incorrect. Sometimes it just flips to the
> first note. The 190-2 is receiving correctly - the 'learn'
> light flashes on, and the notes trigger (ADSR, etc), but
> the pitch is out.
>
> I've stripped my system back to just A-190-2's and A111-5
> (voice module), and each 'voice' is on its own separate
> bus.
>
> The effect is actually quite pleasing, but it would be nice
> to get it working right. Putting together a polysynth is
> quite tricky :)
>
> Ian.

Maybe this behaviour is due to the working principle of the stack mode. In
stack mode the A-190-2 transmits all Midi note data that are not processed
by the module, i.e. the note message that is used to generate the CV/Gate of
the module is not forwarded to the midi output, all other note messages are
routed to the output. It depends upon the exact chronological sequence of
the midi notes of the chord how the midi notes are assigned to the three
A-190-2. Even if you play the keys apparently at the "same time" the three
midi notes are sent one after another and the sequence is not the same every
time.

Best wishes
Dieter Doepfer

Hi

> A-190-2. Even if you play the keys apparently at the "same time" the three
> midi notes are sent one after another and the sequence is not the same every
> time.
I once had to explaine something similar, and made a simple ascii 
graphic for that. It may be helpful here:


In short words: The A190-2's work with a first-note algorithm, while Ian 
expects an lowest note algorithm.

Example with an C major chord (you have to read this with a 
non-proportional font like courier)

You think you do this:

  g ------------  ------------  -----------
  e ------------  ------------  -----------
  c ------------  ------------  -----------

but in fact you play like:

  g   ----------    -----------  ----------
  e  ----------   --------------  ----------
  c -------------  -----------     ----------

and this is the order how the A190-2's will output the notes

A190
#1 ccccccccccccc eeeeeeeeeeeeee gggggggggg   always the first note
#2  eeeeeeeeee    ccccccccccc    eeeeeeeeee  always the second note
#3   gggggggggg    ggggggggggg    cccccccccc always the third note


Florian

Hi

That's what I thought initially - but the stacking doesnt
seem to be working quite as expected on my setup.

Sometimes the full chord doesnt sound ie there are multiple
of one of the notes eg 'c', even though I'm definitely holding
down 3 notes, one of the notes is missing hence 'dropped notes'.

I'm wondering if the note on/off behaviour is confusing the
190-2 stack mode. That is different off's are getting associated
with different (or the same note).?

Ian.

Hi Ian

> Sometimes the full chord doesnt sound ie there are multiple
> of one of the notes eg 'c', even though I'm definitely holding
> down 3 notes, one of the notes is missing hence 'dropped notes'.
The problem might be: if you "doubletrigger" a note at the midi 
keyboard, then two A190's will play this note. The note assignement 
algorhithm assumingly is not only "newest note" but "newest note, round 
robbing" (I'll ask Chris regarding this).

I my graphical example:

you play like:

  g   -----------
  e --------------
  c  - ---------
     ^.^....Doubletrigger!

and this is the order how the A190-2's will output the notes

A190
#1 eeecccccccc always the first note or fourth note
#2  cccccccccccc   always the second note
#3   ggggggggg   always the third note

If the algorithm would be "newest note, last voice" then it would be
#1 eeeeeeeeeeeeee always the first note or fourth note
#2  ccccccccccc   always the second note
#3   gccccccccc   always the third note


Flroain

> Hi
>
> That's what I thought initially - but the stacking doesnt
> seem to be working quite as expected on my setup.
>
> Sometimes the full chord doesnt sound ie there are multiple
> of one of the notes eg 'c', even though I'm definitely holding
> down 3 notes, one of the notes is missing hence 'dropped notes'.
>
> I'm wondering if the note on/off behaviour is confusing the
> 190-2 stack mode. That is different off's are getting associated
> with different (or the same note).?
>
> Ian.

I ask you to contact Christian Assall (software@doepfer.de) and report the
behaviour you discovered. He is the author of the A-190-2 firmware.

Best wishes
Dieter Doepfer

Hi

> I ask you to contact Christian Assall (software@doepfer.de) and report the
> behaviour you discovered. He is the author of the A-190-2 firmware.
I just sent a mail to him.

Florian