Doepfer

> Thanks for all the suggestions! I'll try a few things and watch a
> few days disappear!
>
> But I think it's odd no one has designed a digital LFO module
> that syncs to midi clock. Maybe I can talk someone into doing
> that. So, no one steal my idea!
>
> Also, great to see all the good and insightful feedback in here!
> That's pretty rare on these internets.
>
> Thanks again. Next question coming soon!
>
> Scott
>
> www.scottfromcanada.com

We think about such a LFO since some time but it's not that easy to realize
(for details refer to the preliminary info about the A-143-6 Synchronized VC
LFOs where we think about a midi sync feature too). In midi the max. clock
you can get is 96 ppm (pulses per measure) or 24 ppq (pulses per quarter).
If you think e.g. about a triangle LFO with a period of one quarter you have
only 24 steps for the full period or only 12 steps for one ramp. For a
triangle LFO with e.g. -3V...+3V swing this corresponds to 0.5V steps which
is a bit too stepped. One has to increase the internal master clock (kind of
a digital PLL) to obtain a higher sampling rate of the LFO output steps
(maybe followed by kind of a slew limiter). And this internal clock has to
be synced to midi. Christian is about to find a solution and has already
kind of a digital PLL introduced in the Dark Time sequencer firmware. Maybe
we can use the experience with the Dark Time code to introduce multiple midi
synced LFOs.  But there is always some delay I think several LFOs with
different periods all in sync with a master clock is a good idea. The master
clock could be a PLLed midi clock (i.e. the multiplied midi clock) - and
consequently be in sync with the midi clock - or an analog (e.g. voltage
controlled) clock.

Best wishes
Dieter Doepfer