this post was submitted on 25 Jul 2023
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Behringer 2600 - FM with ADSR - lag? (youtu.be)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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I want to do fm with the asdr, but even with all potis fully down, the pitch starts high and takes about a second to get down.

Is this broken, is it a quirk of the 2600?

Ideally, I would want it to stay flat if all potis are down.

My intent is to generate a similar effect to the lag but much shorter.

Edit: I tried the same with the Arturia 2600 VST, that one behaves as expected.

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[โ€“] [email protected] 2 points 1 year ago (1 children)

I tested this on my Behringer 2600 and got similar behaviour, so I suspect it's a quirk if the hardware, (one that is possibly not emulated by the Arturia VST). One way around it seems to be to patch a gate into the ADSR gate input instead of using the manual trigger button - try patching the internal sample and hold clock into the ADSR gate input, and the envelope stays flat until you raise some of the sliders.

I wonder if it happens when you trigger via MIDI ? (I didn't test) Patching the KBD gate or trigger from the left hand side into the ADSR would be an option to try too.

[โ€“] [email protected] 2 points 1 year ago

A little more experimentation and I've found the ADSR envelope stays almost flat with all sliders down if it's triggered via a 5V gate to the Gate input. There is still the tiniest bump when triggered this way, but nothing close to the effect of the manual gate button. Triggering via MIDI seems to behave more like pressing the manual gate button.

The other interesting thing I discovered is that the LFO 'leaks' into the VCO1 FM mod, even with the vibrato depth and LFO FM mod on VCO1 all the way down. The solution is to plug a dummy patch cable into the "Ext Vib In" input. This seems to break the normalling of the LFO in the right place to prevent this leakage (plugging a dummy cable into LFO FM mod on VCO1 didn't work, which must say something about the signal path the LFO is taking to leak into the VCO1 freq modulation).

One thing I've noticed about the 2600 (and I doubt this is unique to the BARP clone) is there are a lot of signal paths that aren't buffered or isolated like you might expect in a heavily engineered Eurorack module or modern semi-modular. Sometimes it provides interesting character, other times it shows the compromises of it's age and feels a bit broken by modern expectations.