E102 Digital CV Processor (now with audio demos)

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windspirit
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Post by windspirit » Sun Sep 29, 2013 11:00 pm

Image

:razz:

JohnLRice

Post by JohnLRice » Sun Sep 29, 2013 11:08 pm

[video][/video]

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Post by windspirit » Mon Sep 30, 2013 1:17 am

[video][/video]

This is a hijacking, this thread is now going to hawaii!

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Post by paults » Mon Sep 30, 2013 1:18 am

Feel free to stop anytime :mad: :bang: :deadbanana:

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Post by JohnLRice » Mon Sep 30, 2013 1:36 am

Idle threads about up coming over due modules are the Wiggler's play things, or something . . .

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Post by 337is » Mon Sep 30, 2013 9:42 am

(Muff's observation field journal, entry number 32)

It would appear that many in the community not only like and worship cats, but have appropriated certain cat-like behaviors as well:
JohnLRice wrote:Idle threads about up coming over due modules are the Wiggler's play things, or something . . .
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Post by Paranormal Patroler » Mon Sep 30, 2013 2:22 pm

I'm so glad Muff's was down for me since early in the morning. Didn't get a chance to get bumps for all this cat-like behavior.
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Post by Infra » Tue Oct 29, 2013 4:45 pm

Huh missed this.

All kind of stuff is coming out from Synth Tech, that makes all gassy :D
and warm and happy !

Fun times awaits !

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Post by paults » Tue Oct 29, 2013 8:55 pm

I am shipping some modules later this week to Equixnoz, then the E102 gets full attention for the fix for production pc boards (now that the E370/E371 code is 95% done).

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Post by AudioFetish » Tue Oct 29, 2013 10:17 pm

Patiently waiting 8_)

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Post by analogue01 » Wed Oct 30, 2013 7:54 am

AudioFetish wrote:Patiently waiting 8_)
WEBSITE
Rob Ae wrote:plugging CV gate cables in my mouth, to taste the voltages, turned out to enhance my skills.

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Post by hpsounds » Sat Nov 02, 2013 6:31 pm

@ paults
Will this module suffer the same annoying zipper noise most quantizers/digital ASR based on micro-controller have (Quantimator, A-156, FMVDO) when quantizing a new CV value (at the beginning of each quantized voltage) ?

Here are some soundsamples of these problems on the FMVDO (when using the internal quantizer) - I have the same problems w/ the Quantimator and A-156:

In this sample, the INT switch is ON, and after each series of notes, I'm manually modulation the ratio with CV:
https://www.dropbox.com/s/vki8kmgrl4e8k ... Sw_INT.aif

In this other example, the INT switch is OFF:
https://www.dropbox.com/s/bldk1j9w812b0 ... Sw_NON.aif

Thanks for your enlightenment ! :tu:

Hédi K.

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Post by Junk Rhythm » Sat Nov 02, 2013 6:55 pm

hpsounds wrote:Will this module suffer the same annoying zipper noise most quantizers/digital ASR based on micro-controller have (Quantimator, A-156, FMVDO) when quantizing a new CV value (at the beginning of each quantized voltage) ?
Are you using the trigger input on the Quantimator along with a change in CV?

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Post by hpsounds » Sat Nov 02, 2013 6:57 pm

Junk Rhythm wrote:Are you using the trigger input on the Quantimator along with a change in CV?
Yep ! :cry:

The same trigger is used both for the Quantimator Trig input and the Envelator (in AD mode) Gate input (exactly the same behavior with other AD/ADSR env. w/ the shortest attack time).

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Post by paults » Sun Nov 03, 2013 9:34 am

Not sure what you are trying to do.

If you are feeding into the module an envelope or an LFO, then the output will naturally go from 'smooth' to 'stepped', with the interval between the steps the clock and the difference in height step-to-step a function of how fast the input changes AND the interval between clocks.

ASRs are specifically designed to be used with pitch CVs into VCOs, which are the 'note' data (not FM data) and assumed to be 'static' note-to-note.

This is not a 'fault' of the module, it's a 'fault' on using the module not for the intended purpose. If you are trying to delay rapidly-changing CVs (like an envelope), the ASR is not the module to use. You need a module specifically designed to do that function, and I don't know of any. It would be like an audio delay that is DC coupled, with a high internal sample rate (say 20HKZ), a high A/D accuracy (14 bits or so) and a large memory (say 1MB ) to do what I *think* you want to do.

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Post by hpsounds » Sun Nov 03, 2013 10:46 am

Sorry Paul, I will try to explain myself a little bit more clearer (I'm not a native english ...). :oops:

My main interest in the E102 is the ASR function for controlling pitch of VCOs to produce some canons-arabesque sequences. The Quantimator already offers both a quantizer and an ASR, but I always encounter a zipper noise (very fast pitch variation between the last quantized value and the new one) at the beginning of each note with very fast attack time (with slow attack time, the zipper noise is "eaten" by the slow attack).

The problem comes from a lag (maybe 1 or 2 ms, or less ...) between when the envelope open the VCA and when the quantizer outputs the quantized CV value : the envelope opens the VCA before the quantizer outputs the quantized CV value (the on-board micro-controller has to sample the CV value and to look into its lookup scale tables).

Image

BTW, the FMVDO sound samples were just audio examples to help understanding what I was talking about, audio-wise. This VCO has an on-board quantizer that behaves the same way as the Quantimator.

So, I'm wondering if the E102 internal code will be fast enough to offer "nearly" instantaneous quantized CV values and ASR functions at each trigger coming into the CLOCK IN input ??? Or put in an other way : what is the processing time between when a CV is sampled, held and quantized and when the held and quantized CV value is outputted out of OUT1/OUT2/OUT3/OUT4 ?

:hmm: :despair: :hail: :help:

Hédi K.

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Post by akrylik » Sun Nov 03, 2013 11:05 am

@hpsounds, your grasp of English is awesome! :tu:

I haven't confirmed this but I imagine the TRIG OUT on the A-156 will give a trigger signal right after the CV has been quantized.

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Post by paults » Sun Nov 03, 2013 4:28 pm

The delay from a trigger to all 4 DACs being updated is ~ 50us. That should be at least 10X faster than any envelope/VCA can 'open' to hear anything.

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Post by tiny333 » Sun Nov 03, 2013 4:40 pm

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:hmm:

I dont understand what it does

:tu:

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Post by hpsounds » Sun Nov 03, 2013 5:17 pm

paults wrote:The delay from a trigger to all 4 DACs being updated is ~ 50us. That should be at least 10X faster than any envelope/VCA can 'open' to hear anything.
THAT'S what I wanted to know !!! :hyper: :guinness: :love: :yay: :tu: :banana: ... and now you have a new customer for the E102 ! :moneyburn:

:hihi:

Hédi K.

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Post by dj_bluefalcon » Sun Nov 03, 2013 5:34 pm

Oh, man, this is huge. Very excited for this one.

Another gem from SynthTech! Kudos!
:yay:

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Post by paults » Sat Nov 09, 2013 10:30 pm

Quick update:

Was able to sit down today and make all the changes to the pc board in order to see if this is production-worthy. Test boards due back to me around the 21st, guess it's solder and turkey over Thanksgiving. If all goes well, will order production boards right before Christmas break.

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Post by Nuuj » Thu Nov 21, 2013 2:56 pm

Haven't been around much lately.
Glad to see this is still happening.
I've still got four Dixies waiting...
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Post by Summa » Thu Nov 21, 2013 4:53 pm

:hmm: :despair:


come to daddy..

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Post by paults » Thu Nov 21, 2013 9:35 pm

Final (hopefully) check pc boards arrive next Tuesday. Guess I'll spend 'Black Friday' stuffing them and testing.

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