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QuNexus - Kickstarter for mini keyboard with CV I/O
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Author QuNexus - Kickstarter for mini keyboard with CV I/O
skrasms
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PostPosted: Wed Jun 26, 2013 9:12 pm    Post subject: Reply with quote Add User to Ignore List

I installed the firmware update, but I still hear slew. I scoped the output voltage again to see the difference. Here is a capture of a 2V output step from before the update:



Here it is after the update:



Try to ignore the vertical bars. The time scale is the same for both captures. The new version definitely gets "most of the way there" faster, but the time it takes to fully settle at the target pitch looks about the same. It sounds less annoying than I remember it being before the update.
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slovo
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PostPosted: Thu Jun 27, 2013 1:48 am    Post subject: Reply with quote Add User to Ignore List

I guess we have to assume this is the best they could do given the limitations of the hardware...
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radiokoala
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PostPosted: Thu Jun 27, 2013 3:00 am    Post subject: Reply with quote Add User to Ignore List

I wonder how different the amount of money they collected on kickstarter would be if they had shown those pitch cv scope shots in the beginning...
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filmersam
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PostPosted: Thu Jun 27, 2013 4:59 am    Post subject: Reply with quote Add User to Ignore List

I bet it's really expensive hardware that outputs non-slewed CV.
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newgreyarea
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PostPosted: Thu Jun 27, 2013 1:32 pm    Post subject: Reply with quote Add User to Ignore List

Booooo!!!!
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soundwave106
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PostPosted: Thu Jun 27, 2013 8:30 pm    Post subject: Reply with quote Add User to Ignore List

filmersam wrote:
I bet it's really expensive hardware that outputs non-slewed CV.


I seriously doubt that... I'm curious what DAC and op amp they are using to produce that shitty of a slew... confused

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slovo
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PostPosted: Thu Jun 27, 2013 8:59 pm    Post subject: Reply with quote Add User to Ignore List

I'm too noob to feel understanding from an oscillo reading tho. Any chance to get an audio demo? I keep thinking perhaps if it's slight enough I could live with it as a minor limitation... I dunno
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johnnylonz
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PostPosted: Fri Jun 28, 2013 10:38 am    Post subject: Reply with quote Add User to Ignore List

Pretty lame, I was looking forward to picking one of these up. Hopefully it gets sorted at some point.
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newgreyarea
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PostPosted: Fri Jun 28, 2013 11:37 am    Post subject: Reply with quote Add User to Ignore List

I've been using it with my iPad while traveling. Pretty decent for that. VERY disappointed with the CV slew. I could have purchased a much less expensive iPad keyboard.
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theabsent
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PostPosted: Sat Jun 29, 2013 2:27 pm    Post subject: Reply with quote Add User to Ignore List

Anyone in europe want to unload their slewy qunexus? cool
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amnesia
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PostPosted: Fri Jul 12, 2013 6:46 pm    Post subject: Reply with quote Add User to Ignore List

that sux
I wanted to buy one but wont until the slew is fixed

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SamUK
Wiggling with Experience


Joined: 17 Mar 2011
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PostPosted: Sat Jul 13, 2013 12:59 am    Post subject: Reply with quote Add User to Ignore List

skrasms wrote:
I installed the firmware update, but I still hear slew. I scoped the output voltage again to see the difference. Here is a capture of a 2V output step from before the update:

...

Here it is after the update:

...

Try to ignore the vertical bars. The time scale is the same for both captures. The new version definitely gets "most of the way there" faster, but the time it takes to fully settle at the target pitch looks about the same. It sounds less annoying than I remember it being before the update.


Have any of the owners contacted KMI support about the 'fix'?
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earlykooka
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Joined: 17 May 2011
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PostPosted: Sat Jul 13, 2013 4:20 am    Post subject: Reply with quote Add User to Ignore List

I was looking to buy one to use for ,iPad and laptop, and principally for CV ... so very disappointed re the slew.

a couple of questions :

is the slew time/shape identical on all three CV outs ?

with the new 'gets most of the way there quicker' update, if you put a quantizer on the CV from the Qunexus, is the slew shape 'slow' enough that you hear it it go through other note(s) ? (unfortunately I am guessing the answer is yes based on the oscilloscope) .. but could a partial workaround ( for sequencing applications) be using a triggered quantizer, and delaying the trigger just enough to let the slew go by ? - thus replacing slew by latency ( which can then be adjusted for, in most sequencer programs and some hardware)

jumping through hoops for sure, but for some applications could maybe be a workaround ?
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sersch
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Joined: 19 Nov 2011
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PostPosted: Sat Jul 13, 2013 4:38 am    Post subject: Reply with quote Add User to Ignore List

I am not an owner of QuNexus, but I asked KMI support nevertheless if the slew can be reduced further. The answer was that they doubt it will get any faster.

As I am planning to use the QuNexus as a MIDI controller only, I am still planning on getting one (once it will become available here in Germany).

Please, can somebody be so kind and post two audio examples with the latested firmware, one of alternating 1 octave playing, and another one with alternating 2 octave playing?
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joshuagoran
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Joined: 09 Apr 2013
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PostPosted: Sat Jul 13, 2013 4:43 pm    Post subject: Reply with quote Add User to Ignore List

sersch wrote:
I am not an owner of QuNexus, but I asked KMI support nevertheless if the slew can be reduced further. The answer was that they doubt it will get any faster.

As I am planning to use the QuNexus as a MIDI controller only, I am still planning on getting one (once it will become available here in Germany).

Please, can somebody be so kind and post two audio examples with the latested firmware, one of alternating 1 octave playing, and another one with alternating 2 octave playing?


This would be helpful. I mainly want one for CV only uses so if it sounds like zombie then it's a no go for me. Create Digital Music says they plan to do a follow up review with Eurorack/MS-20 mini equipment.
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filmersam
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PostPosted: Sun Jul 14, 2013 4:29 pm    Post subject: Reply with quote Add User to Ignore List

soundwave106 wrote:
filmersam wrote:
I bet it's really expensive hardware that outputs non-slewed CV.


I seriously doubt that... I'm curious what DAC and op amp they are using to produce that shitty of a slew... confused


Yeah I was being a little sarcastic.
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chipaudette
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Joined: 04 Oct 2012
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Location: Vermont, USA

PostPosted: Sun Jul 14, 2013 8:51 pm    Post subject: Reply with quote Add User to Ignore List

filmersam wrote:
soundwave106 wrote:
filmersam wrote:
I bet it's really expensive hardware that outputs non-slewed CV.


I seriously doubt that... I'm curious what DAC and op amp they are using to produce that shitty of a slew... confused


Yeah I was being a little sarcastic.


I'm assuming that it is not a DAC, or else it wouldn't have the slew. Instead, I bet they're doing PWM off one of the digital pins on the microcontroller. They then have to put in a resistor and cap to act as a low pass filter to get rid of the high PWM frequency. Even with sneaky PWM encoding, the resistor and cap will ultimately limit how fast the CV output can change.

Chip

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Last edited by chipaudette on Mon Jul 15, 2013 5:42 am; edited 1 time in total
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joshuagoran
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Joined: 09 Apr 2013
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Location: NE Ohio, USA

PostPosted: Sun Jul 14, 2013 9:33 pm    Post subject: Reply with quote Add User to Ignore List

I found these audio tests of the slew issue. Not mine, just to be clear.

This definitely helps me put things in perspective. Not the worst thing I've ever heard, but certainly not "Snappy" as I saw quoted (or at least I think it was quoted) in CDM's recent feature (which comes off like an extended advertisement... confused ) on the QuNexus.

Might be liveable for me, but I tend to like glide/portamento anyway and might just deal with it. YMMV screaming goo yo
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ersatzplanet
Synthwerks Design


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PostPosted: Mon Jul 15, 2013 11:49 am    Post subject: Reply with quote Add User to Ignore List

joshuagoran wrote:
I found these audio tests of the slew issue. Not mine, just to be clear.

This definitely helps me put things in perspective. Not the worst thing I've ever heard, but certainly not "Snappy" as I saw quoted (or at least I think it was quoted) in CDM's recent feature (which comes off like an extended advertisement... confused ) on the QuNexus.

Might be liveable for me, but I tend to like glide/portamento anyway and might just deal with it. YMMV screaming goo yo


The QuNexus vs. the Kenton seems to really show the difference. The QN's slew is not too bad and I could probably live with it. I seldom do 3 octave jumps like that anyway.

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slovo
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PostPosted: Mon Jul 15, 2013 1:50 pm    Post subject: Reply with quote Add User to Ignore List

I love to do wacky stuff like that, but I still might live with it. It does so many other things so affordably that it might be worth it to have some minor quirks.
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