Analogue-sequencer

>There shouldn't be much drift in the 808 DIN clock.
>The tempo may gradually change with temperature, since the clock is built
>from some logic gates, resistors and caps. The thresholds will move
slightly
>as things warm up, but not so it should really be noticeable as any kind of
>'feel'.
>The way the 808 CPU resonds to the DIN clock causes a timing variation that
>you may notice...
>This effect is more noticeable on the 303, which uses the same CPU (with
>different code, obviously) and the same method of following the clock.
>There is an extra timer circuit interrupting the 808, 303 and 606 CPUs
every
>2ms or so.
>The DIN clock line is checked to see if it has gone high during the
>interrupt routine triggered by this extra clock.
>So in effect, the 808 CPU quantises the incoming DIN sync to 2ms intervals.
>This introduces a very subtle timing shift depending on the underlying
tempo
>of the clock signal. You very likely wont notice it consciously, although
>you can notice the effect on the 303 if you set up a pattern to repeat the
>same note every 16th, set up a sound with a very snappy envelope, then
>gradually increase the tempo. There is a cyclic shift in the sound as the
>relationship between the tempo clock and fixed interrupt clock changes.

>Cheers,
>Colin f

Maybe im confused but are you talking about the P3 driving the 808 above?
What i mean is the 808 driving the P3.

When i use the 808 as tempo master through the dyn to midi converter there
is a tempo variation which can be seen on ableton or cubase bpm counter.
It drifts regularly by up to 2 bpm.

/m

> Maybe im confused but are you talking about the P3 driving the 808 above?
> What i mean is the 808 driving the P3.
> When i use the 808 as tempo master through the dyn to midi converter there
> is a tempo variation which can be seen on ableton or cubase bpm counter.
> It drifts regularly by up to 2 bpm.

That should be a fairly gradual change in tempo though - the 808 clock circuit should be 
pretty stable, unless your tempo pots are crackly.
Are you sure the tempo variation isn't just imagined by the crappy timing of Windows ?
I'll need to check out the timing on my 808 to see how it looks.

Cheers,
Colin f

Being technically naïve, I can wish for things like this, without having any
idea how feasible they are...

I would just love it if my P3 had a readout under each step showing its
value. OR, that there were computer software which communicated with the P3
so that I could just see all of the values for each parameter laid out on
the screen.

Given that I'd already rather have a P3 than any other hardware sequencer
that I know of, some of which are WAY more expensive, I'd certainly save to
buy such a version, or purchase such software, or whatever.

Ok, back to my ordinary delusional state.

> I would just love it if my P3 had a readout under each step 
> showing its
> value. OR, that there were computer software which 
> communicated with the P3
> so that I could just see all of the values for each parameter 
> laid out on
> the screen.

More display estate would be good. An attached computer for other than
offline editing and/or storage management wouldn't really be my thang. As
you can probably guess, more displays add more cost, and not everyone wants
them.
If the production P3s are a commercial success, then maybe I can do the
uber-sequencer for the insatiable step-sequencer fan.
Rome wasn't built in a day, etc.

Happy new year,

Cheers,
Colin f