[sdiy] Thoughts on drum synth

[cyborgzero at comcast.net]

Well, after much consideration, I had a problem I wanted to look into
that dealt with the way that circuit is built affecting the overall
volume of the sample in an inconsistent way.

I remember the equation I used I got from this list, and it seems that
depending on all the variable, that the Q of the circuit is at some
threshold which makes the volume vary, but I forgot exactly how I did
it, and got sidetracked on another escapade before it was finished.

On my machine, I originally lowered the value of R57 from 47K to 22K
iirc. This should increase the volume..

There seems to be some interaction between the other voices and the BD
that seem to cut off the BD at times making it fluctuate..

Now, mind you, I have the full sweep and sweep decay mods on mine, so
that might somehow stabilize the circuit, but I think it was more the
lowering of R57 that did it. You just won't get a really upfront boom
until you lower it.

Rob

----- Original Message -----
From: "mark verbos" <a0284520 at addcom.de>
To: <cyborgzero at comcast.net>; "synth DIY"
<synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 02, 2002 5:53 AM
Subject: Re: [sdiy] Thoughts on drum synth


> Well, to be honest, I didn't even add the sweep part. I just did the
> tune and decay controls. With a little more decay and a lower
tuning,
> you get a really nice 808 type sound. the problem lies in the fact
that
> it plays at a different volume every time. So if you use it in the
mix
> the kick seems to jump out and then disappear all the time.
>
> does the sweep mod solve this? i can't imagine it would, but I'm not
sure.
>
> mark
>
> cyborgzero at comcast.net wrote:
>
> >With some *very* fine tuning, that circuit can be modded to get
some
> >very convincing 909 emulations..
> >
> >The really hard attack at the beginning is the tune sweep amount
and
> >decay. I have messed with routing the noise circuit to the tune
> >modulation, and you can get some really good visions of the 909.
> >
> >BTW, I hope you tapped off of the BD trigger for the sweep circuit.
> >You don't need to tap off of the tom trigger. I didn't understand
why
> >anyone would do that, but The Mix printed it that way.... Seems to
be
> >the biggest source of problems.
> >
> >ie jumper the trigger from the BD straight into the transistor for
the
> >sweep.
> >
> >Rob
> >
> >----- Original Message -----
> >From: "mark verbos" <a0284520 at addcom.de>
> >To: "harry" <harrybissell at prodigy.net>; "synth DIY"
> ><synth-diy at dropmix.xs4all.nl>
> >Sent: Monday, April 01, 2002 2:49 PM
> >Subject: Re: [sdiy] Thoughts on drum synth
> >
> >
> >>in my opinion the 909 is by far the best one Roland did. The 808
has
> >>more bottom end, but it doesn't have the attack noise that makes
it
> >>
> >work
> >
> >>like a real drum would in the mix. The 606 is really tinie, as is
> >>
> >the
> >
> >>CR-8000 or other twin-T types. I think they are funny at best I
have
> >>
> >a
> >
> >>606 that I did the mods from keyboards magazine on. the bass is
> >>
> >huge,
> >
> >>but the drum is very inconsistant. one trigger to the next varies
> >>
> >way
> >
> >>too much in my opinion.
> >> The 909 can be tuned really low and long, and be tuned up high
for
> >>
> >a
> >
> >>better thump in the mix. I think it is the ultimate analog kick
drum
> >>solution. If you compress it and bring out the attack even more,
> >>
> >it's a
> >
> >>monster. Maybe you can work with the 909 design a little to make
the
> >>volume envelope sweep more, increasing the attack. Or, maybe make
a
> >>
> >real
> >
> >>envelope there insted of the mini one it has. Then you can tweak
the
> >>volume shape to perfection.
> >>
> >>mark
> >>
> >>harry wrote:
> >>
> >>>
> >>>Any opinions on the "sound" of some approaches such as the
various
> >>>
> >Rol at nd units?
> >
> >>>Any favorites ?   Ones not to waste time on ?
> >>>
> >>>H^) harry
> >>>
> >>>
> >>
> >
> >
>
>