Behringer 2600 external clock issue 

I am not alone! Have had my blue one for a week and studied the lower features today. Thought the external clock input was defective, but luckily found this video within a minute. Greetings from Germany🇩🇪🤝

It's a bug in the manual, and possibly an Arp design flaw as well. The original Arp 2600 is indeed hardwired exactly the way you experience here. It's insane, makes the whole block unusable most of the time.

Exactly what I wanted to see. Thanks for this, well explained.

I've got mine on order, hopefully receive it in January. These are interesting features to make creative use of.

Interestingly, the panel printing on the orange faced 2601 from the late 70s is different to the Behringer and the older black face 2600. It shows internal clock routed past the ext clock in and going to the clock out Jack, with a line going off it, through the ext clock in and into the sample and hold. So that looks to me like they knew in 1977 that this behaviour was not what is shown on the panels of the black face 2600. The block diagram in the Korg 2600 manual seems to back this up. At least it’s not just me. The question is, how would you sync the internal clock with something? Is it even possible?

Just received my 2600 and Behringer changed the orange diagram on the INT CLOCK.

Regarding to the original service manual, this is expected product behaviour and the original circuitry. The external clock is feeded after the Electronic Switch Circuit.

Thank you for this video. I just tought that my external clock input socket is broken, but you showed me that it is not :-)

Same issue here with the Korg ARP 2600 M. Tried sending clock signal from both Arturia Keystep Pro and Moog DFAM. However, the EXT clock input works for pitch modulation on the 3 oscillators.

Leaving the patch cable half way out does the trick. Why, I don't know.

If you are bringing in a square wave, from outside, you have one side of the switch anyway. Invert it to get the other side. Patch those 2 sources instead of the internal clock. Think of the switch as an extra LFO where nothing is plugged into the Switch Source. When you have something else plugged in, it will redirect it to the 2 output, or it can be set up to work in reverse (alternate between 2 inputs)

I find leaving the patch cable half way out makes the switch sync with external clock - not ideal, but handy nonetheless

the manual is very clear, "ext clock in" broke the s/h internal connection clock for the s/h, it dont change the internal clock , it is not for the switch, the manual says clearly that the siwtich is connected to the internal clock; so this in not an issue

I might be wrong but... What about sending a mult of the EXT clock source to the EXT Clock IN of the S/H and the S/H clock input of the envelope? You can exploit the design "flaw" so the internal clock can control the Switch independently?

I wonder how come they didn't incorporate midi clock through the usb port for sync

Same here on mine. Try to trigger the adsr with the intClockOut from the S&H unit.

Thanks, now it’s clear. I notice this just a day after getting my 2600 so I sent a ticket to Thomann with a video explaining the issue and...they told me the unit was wrong, so they will change it for a new one. The manual is wrong and the technical service doesn’t know.

You could get some way there by multing your external clock to the sample and hold, and both envelopes’ gate inputs.....but this wouldn’t fix the issue with the electronic switch. Does the internal clock sync to midi?

I have a feeling there will be no firmware update

Thanks for a very useful video! I was thinking that the clock is defective... I still think it is, but not just on my unit. I'd prefer Behringer to try to improve the 2600 rather than fix the manual. :-)

Ahhh....I love the internet. Got mine just a week ago (after a long time of consideration due to eurorack GAS - so much gear, so little time) - love it and thought that mine is broken 😀 Thanks for the video!

I see you have a new profession Agent Smith

Can anyone tell me if their vibrato depth goes to the pitch of all oscillators without patching? It does on mine!

Listening to all the video's of the Behringer version just makes me wish I had pre ordered the Korg remake instead of over thinking it. If Korg announced another batch now I would not hesitate. Unfortunately I don't think they will.

Es así!!! El original es igual!!!

Does it work correctly with midi clock?

this unit sounds great but it has an lot of timing issues.

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