Behringer 2600

[Bata]

Couple more weird patch ideas.

[Bata]

Ok this is probably the last one I'll post unless I make a really useful discovery. Can anyone tell me what is going on in the first minute and a half of this video? I'm taking the S/H out to the S/H in and moving the S/H level amount for some stepped values where the amount of steps is determined by the rate of the clock.

[Audiohub]

There doesn’t seem to be much actual info about the Midi implementation for the B2600; nothing in the quick start guide other than how to set the slide switches in the back to select the Midi channel.
Does this unit respond to any Midi info besides note on/offs?
I’m curious if it responds to pitch bend from a controller keyboard? (Or anything else)
Thanks!

[jimmie]

pitch bend works fine with an external midi keyboard on mine. I think I read somewhere that you could change the range via Beri software if my memory serves.

[Bata]

I was getting some strange behaviour (I think?) putting the pitch switches of the oscillators between audio and low. Not sure if this was just giving a different value or jumping around it seemed inconsistent. I don't think this is worth a video but I'll play around with it some more and see if there is anything usable that can be done with this.

[nuketifromorbit]

Just bought a blue marvin and I'm curious about a couple things. First of all does the douphonic mode only work if the upper voice out is patched into one of the vcos and secondly I've noticed that the response of the vco fm inputs differ between one another? Is the later due to some of the fm inputs being exponential as opposed to linear? I've watched a video that explains that this is the case with the vca, for example the adsr input is exponential while the ar input is linear.

[KSS]

Yes, patch the 2nd voice with the regular KBD CV to get Duophonic. <--the Duo output is the CV difference between the two pressed keys.
No, the VCO FMs are all exponential.

[Bata]

On the Behringer I think he's right about them responding differently. When I first got the thing I tried sending a 1v/oct sequence to them and the first modulation input was different than the 2nd and 3rd if I recall correctly. For normal modulation there isn't enough of a difference to choose one over the other I thought but maybe I have to look into this.

[KSS]

It could be the tolerance variation in the Resistors and sliders used. They are not calibrated inputs.

In an orginal ARP, there are five 100k log pots-sliders, each feeding a100k series resistor. These all meet at pin 1 ov the VCF sub-module.
Was answering VCF when the question was VCO.

Yes, the VCOs *do* have different mixing levels -and so different repsonse- per input for their FM chammels.
Like the filter thy all go through 100 Audio sliders and then each to its wiper-summing resistor. Taking VCO1 as example, Page 15 of the service manual 112+ page version, NOT the 53 or 58 page version- shows the different resistors setting different mixing levels into the FM CV sum node. The S/H normalled one uses 100k, while the ADSR normalled input has a 220k sum resistor. VCO2's SIN normal into VCO 1 is mixed with a 470k resistor. Nearly a 5 to 1 difference between the 1st and 3rd FM CV nputs.

Due to these summing resistor differences you *will* have a different result when you over-ride the normals with patchcords. VCO2 and 3 are similarly scaling the different FM inputs.

[Bata]

This is the last patch I plan on sharing in video form. I thought it turned out pretty well. I might post more of these to soundcloud but I'm probably done with the solo barp videos for a while unless I get a 2nd one.



here's the soundcloud for anyone wanting to keep up with my patches. There isn't anything there yet except a couple old jams but I plan on uploading one patch that uses the 2600 later tonight. https://soundcloud.com/bata9999

[nuketifromorbit]

It could be the tolerance variation in the Resistors and sliders used. They are not calibrated inputs.

In an orginal ARP, there are five 100k log pots-sliders, each feeding a100k series resistor. These all meet at pin 1 ov the VCF sub-module.
Was answering VCF when the question was VCO.

Yes, the VCOs *do* have different mixing levels -and so different repsonse- per input for their FM chammels.
Like the filter thy all go through 100 Audio sliders and then each to its wiper-summing resistor. Taking VCO1 as example, Page 15 of the service manual 112+ page version, NOT the 53 or 58 page version- shows the different resistors setting different mixing levels into the FM CV sum node. The S/H normalled one uses 100k, while the ADSR normalled input has a 220k sum resistor. VCO2's SIN normal into VCO 1 is mixed with a 470k resistor. Nearly a 5 to 1 difference between the 1st and 3rd FM CV nputs.

Due to these summing resistor differences you *will* have a different result when you over-ride the normals with patchcords. VCO2 and 3 are similarly scaling the different FM inputs.

Cool, huge relief, can't thank you enough for the info.

[tomteedom]

This is the last patch I plan on sharing in video form. I thought it turned out pretty well. I might post more of these to soundcloud but I'm probably done with the solo barp videos for a while unless I get a 2nd one.

Some pretty angry robots in there , nice

[TumeniKnobs]

For anyone thinking about getting one of these, Sweetwater is currently selling new units for $499. I’ve been on the fence since it came out, but at this price for new, I just ordered my first B product. Im really interested to try this slider based synth paradigm. Cheers!

[Bata]

I'm getting some interesting results running an LFO into the ring mod and then from the ring mod into the preamp then into the other input of the ring mod. Adjusting the amount of each input of the ringmod changes the effect. Not sure whats going on here exactly.

This works with the DC sources as well to make an extra LFO type thing.

[nuketifromorbit]

So are the mixer out and post mixer out jacks actually for external input? They seem to behave that way.

[Bata]

Yeah but you can use them as a mixer output if you put a cable in half way.

[nuketifromorbit]

Lol, jesus this thing is weird. Thanks for the tip. Behringer sure as hell dropped the ball with the manual.

[KSS]

In the original ARP the 2 mixer sliders are meant to be able to be disconnected and used as general attenuators. That's why the arrows of the upper jacks for those sliders point the 'wrong' way.

[Bata]

I'm getting some interesting results running an LFO into the ring mod and then from the ring mod into the preamp then into the other input of the ring mod. Adjusting the amount of each input of the ringmod changes the effect. Not sure whats going on here exactly.

This works with the DC sources as well to make an extra LFO type thing.

Here's a video showing what I was talking about. I don't do a very good job of showing off this trick. I was getting a lot of cool sounds that I wasn't able to recreate in the video. Works best if the lfo is being reset by midi.

[Bata]

You can actually make an LFO by running out of the ring mod into the preamp then out of the preamp into the ring mod and out of the envelope follower into the other input of the ring mod. If you send this extra lfo back to one of the inputs of the ring modulator and play with the envelope follower amount you can get a self modulating lfo type thing. Video coming soon! Need stackables to do this properly.

[Bata]

Sub Oscillator Trick*



*edit: I've been corrected that this is not a sub oscillator at all but just the sine wave from VCO 2 making things thicker. This is a bit embarrassing but I'm going to leave the video up for now anyways because when I tried the alternative to this (patching VCO 2 sine directly to VCA) I wasn't getting as strong a signal as the ringmodded version so this possibly still has some use. Might take the video down though.

[Bata]

You can actually make an LFO by running out of the ring mod into the preamp then out of the preamp into the ring mod and out of the envelope follower into the other input of the ring mod. If you send this extra lfo back to one of the inputs of the ring modulator and play with the envelope follower amount you can get a self modulating lfo type thing. Video coming soon! Need stackables to do this properly.

You can just use the preamp fed back into itself to get an lfo but this way can give some interesting self modulating results. Still in the early stages of figuring this out so apologies for the slow pace of the video or any possible misinfo. Episode 30 of patching with commentary had an audio problem and will be uploaded later.

[OleKim84]

How is the quality of slider pots on these Behringers ?
I think this is the first thing that shall go bad over the years.

[Bata]

I think KSS said the sliders should be good for up to about 20,000 uses before having to be replaced but it could be far less like 7,500. Forget if these were the exact numbers he said but it was something like that. I'm expecting to have to replace a few on mine like filter, internal clock rate, and lfo speed because I move those quite a lot. I think my plan is to buy about 10-20 Bourns sliders and keep them handy for if a couple need replacing. I plan on getting a second one of these so I think 20 should be good. I think there are 2 different kinds used in the B2600.

[KSS]

Bourns PTL sliders are similar to what B uses, and are 15K cycles life.

There are 4 values used by ARP, can't say for sure about B's version but should be same?
100k audio rotary for Preamp
1M audio for lag and AR, ADR
100k linear
100k audio

3620 uses those same slider values and adds
one 100k linear rotary pot for the pitch bend