Perhaps you have to do something else to set midi (4.3)
I just looked at your screenshot again. I think you need the CV-Midi module not the midi-CV you selected.
The way you connected it you get a clock from your Behringer audio interfaces clock to Clocked‘s BPM input. Which I don‘t think you want.
You need to connect one of the clock outs of Clocked (preferably not the main one, since you have div/mult on the lower ones) to the clock in of the CV-midi module.
He wants to sync Rack to the RD-8 and not the other way around. It is known that Rack v1‘s MIDI clock out is quite unstable so this is a valid request.
I just tried it again. I noticed that the BPM makes more or bigger jumps when the block size is higher.
in the vcv manual: " The block size sets the number of samples to store in the audio buffer before releasing to the audio device. A higher size results in more latency (blockSize / sampleRate seconds), but a lower size requires your operating system to communicate with the audio device more frequently, resulting in potentially less audio stability. A good balance can be found by increasing the block size until no audio “glitches” are heard."
I have a Core i7-3770 CPU @ 3.40GHz with 20 GB RAM… actually thought that it was enough
I use the CLK/N output of the MIDI-CV set to 16th, if I want to sync VCV to AUM on my Ipad. That goes directly into clock dividers & multipliers to clock the VCV-Modules. I am sure it is still not a stable clock, but that works for me and I can’t here any glitches.
I reproduced your scenario with my Minibrute 2s and have the same jumps in Clocked exactly as described.
I often sync the other way around - external stuff from NI Machine or Reaper and I can see similar jumps in my external sequencers bpm-display, ‚unstable clock!‘-warnings, as well. I find it quite common and most of the time I just deal with it as I find the bpm-displays concerning, but the timing not really strange from a listening point of view.
I don‘t think your computer is a weak link spec-wise. Keep in mind that midi-hardware-syncing in both directions was successfully done on Ataris 30 years ago.
You seem to be on a PC? - I read about macs that they went away from giving midi, especially over usb, a high priority, which is why I am using the midi-port on my firewire-soundcard sometimes for syncing. (To use a dedicated port with nothing else disturbing the clock might be a good idea in general.)
Although this ain‘t perfect either I have smaller jumps on my sequencer‘s display using the firewire-port. Maybe this is just black magic, I haven‘t really tested and compared it.
I guess my point is: unfortunately in neither direction I experience a trustworthy stable clocking over midi ever and nevertheless I still do it all the time, and it kinda works for me. And also: I am not sure, this is a VCV-problem, only. - Not sure a version 2 will solve it completely.
Did you try other DAWs as slaves having a stable read and feel?
I have no experience doing this, but I wanted to mention it: there are ways of syncing with audio instead of midi, maybe you want to look into that.
Let us know, if you came up with a solution that works for you. Also, if you run into other problems, of course.
Yes you´re right. I turned the whole thing around: vcv as master. The effect is the same. The less the blocksize, the more the tempo display of my RD8 weave. The problems with the clock are only eye-controlled. According to the scope or the metronome or according to my hearing, the clock seems stable.
I am aware of the VCV-midi-drift-problem and I am thankful, this problem is addressed.
Maybe my text was a bit ambiguous.
I didn’t want to say: ,VCV has no drift-problem‘, but instead: ,whenever I sync hardware and computer (any direction) via midi, I do experience drift-problems of a similar sort, VCV included or not.‘
Still, as long as the groove doesn‘t seem as troubled as the visual bpm-representation, I just deal with it for the moment.
I‘d love to have the same rock solid connection that I see in hardware via voltage.
If you have an audio input on your soundcard you can send clock pulses through the audio module and sync the clock to them. This should give very good results.
But you should initialize the Audio-8 module each time you start Rack or load a patch, because there is a small bug that causes additional latency on the audio inputs if you don’t first initialize it each time.
Also you might have to put the received clock pulses through an attenuator with offset, depending on what shape they arrive in at the audio input. They might get filered and offset by the soundcards internal filters, so watch them on a scope and adjust them if needed.
Oh, I know, and you are correct. It’s just a reflexive action on my part 30 years later - Atari people think there was no midi software before the Ataris.
