My ADDAC805.VS2 review

New Interfaces for Analog Synthesizers.

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pugix
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My ADDAC805.VS2 review

Post by pugix » Tue Sep 08, 2020 5:15 pm

I just got an ADDAC805.VS2. Very nice module, but I found a small flaw. Here's my review.

https://pugix.com/synth/addac805-vs2-vc-signal-router/
Richard
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"Everything in our world is actually always modulated by everything else." - Peter B

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Re: My ADDAC805.VS2 review

Post by pugix » Sat Oct 31, 2020 2:49 pm

I have been in contact with ADDAC and received a DIY modification that fixed the issue.
Richard
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Re: My ADDAC805.VS2 review

Post by pugix » Thu Nov 05, 2020 12:19 pm

Here's my description of the fix.

https://pugix.com/synth/addac805-vs2-gain-fix/
Richard
https://www.pugix.com

"Everything in our world is actually always modulated by everything else." - Peter B

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Re: My ADDAC805.VS2 review

Post by mafouka » Fri Nov 13, 2020 3:03 pm

:guinness: Wow, thorough work there mate! Very nice. The 805 is awesome.

I did a mod on one of my ADDAC floor control modules allowing 10v output vs the original 5v. They're really responsive and helpful with that sorta stuff which is pretty clutch imo
這一生中有多少人擦肩而過?而朋友是多麼可貴啊

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Re: My ADDAC805.VS2 review

Post by afaafa » Tue Feb 09, 2021 2:02 am

pugix wrote:
Thu Nov 05, 2020 12:19 pm
Here's my description of the fix.

https://pugix.com/synth/addac805-vs2-gain-fix/
It's interesting that you see an exponential curve, when I would expect a logarithmic curve to give equal power panning and crossfading. Do you notice a drop in level in the middle?

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Re: My ADDAC805.VS2 review

Post by pugix » Thu Feb 11, 2021 2:29 pm

afaafa wrote:
Tue Feb 09, 2021 2:02 am
pugix wrote:
Thu Nov 05, 2020 12:19 pm
Here's my description of the fix.

https://pugix.com/synth/addac805-vs2-gain-fix/
It's interesting that you see an exponential curve, when I would expect a logarithmic curve to give equal power panning and crossfading. Do you notice a drop in level in the middle?
I did the following experiment. Patched an audio signal into both sides of a crossfader. Monitored the output while turning the knob. Result: At either extreme of the knob the signal out is at unity gain. As the knob approaches the center (11 o'clock or 1 o'clock) there is a small increase above unity gain, and then at 12:00 drops back to unity. So there is a drop at the center, BUT there's a small increase just before the center on each side.

I tested the left and right faders, plus the master in XFade mode. They all worked the same.
Richard
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Re: My ADDAC805.VS2 review

Post by afaafa » Thu Feb 11, 2021 8:03 pm

Huh, that's a curious result. The slight increase as you approach the center sounds like something approaching an equal power curve, for which I'd expect rounded peaks and sharp troughs, the inverse of your graph. Given that you fed it +5V, could it be flipping the polarity of your signal at the output?

The return to unity at 12:00 suggests the curves meet at -6dB in the center, which would imply linear or S curve or some combination of the two. That would look even less like your graph, unless there's some other factor I'm not accounting for. I'm spending too much time trying to figure out how that would happen mathematically, when it probably won't make much of a difference in practice.

At the end of the day, this module looks like a cheaper, more flexible alternative to Make Noise's X-pan. Is that a fair assessment?

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Re: My ADDAC805.VS2 review

Post by pugix » Thu Feb 18, 2021 10:29 am

I do think the ADDAC is more flexible than X-Pan. X-Pan has fixed routing and has no CV attenuators, whereas the ADDAC805.VS2 has plenty of routing options and reversible attenuators on the CV inputs. One thing X-Pan can do that the ADDAC can't is separate panning of the cross-faded signals.
Richard
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Re: My ADDAC805.VS2 review

Post by Bachelard » Wed Jul 07, 2021 6:32 pm

I'm really enjoying having the 805 in my system, although I'm still familiarizing myself with the master/direct switches and how the inputs are normalled. But I'm really excited about its possibilities with mixing and cross-fading CV signals with it - sequences blending into non-stepped CVs, etc.

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