CV noise?

TheOtherSupport@KMI
Posts: 728
Joined: Fri Jan 31, 2014 5:31 pm

Re: CV noise?

Postby TheOtherSupport@KMI » Wed Sep 26, 2018 3:56 am

Did you see this post? A USB isolator removes the noise.

TheSupport@KMI wrote:And similar to Danimal's solution, if people don't want to be running computers without ground they can get a USB isolator, which is basically just a ground lift for a USB signal. Put it between the computer and QuNexus and the noise goes away.
neurocrash
Posts: 7
Joined: Sat Sep 22, 2018 2:59 pm

Re: CV noise?

Postby neurocrash » Wed Sep 26, 2018 4:39 pm

Sorry, I missed that.

Even with the LEDs off I do get some CV noise (rising and falling along with the CV signals) when the instrument is not producing loud signal. I applied a noise gate to hide this, but an isolator is a better option.

Thanks for helping me see this!
neurocrash
Posts: 7
Joined: Sat Sep 22, 2018 2:59 pm

Re: CV noise?

Postby neurocrash » Wed Sep 26, 2018 5:24 pm

Yikes, the only USB 2.0 (High speed) isolator I can find is $200.
TheOtherSupport@KMI
Posts: 728
Joined: Fri Jan 31, 2014 5:31 pm

Re: CV noise?

Postby TheOtherSupport@KMI » Thu Sep 27, 2018 8:30 am

You don't need high speed for MIDI, this should work: https://www.amazon.com/SMAKN-Isolator-D ... B00XXPO4UG
neurocrash
Posts: 7
Joined: Sat Sep 22, 2018 2:59 pm

Re: CV noise?

Postby neurocrash » Fri Sep 28, 2018 3:49 pm

That's the one I ordered. Will report back soon.
neurocrash
Posts: 7
Joined: Sat Sep 22, 2018 2:59 pm

Re: CV noise?

Postby neurocrash » Fri Oct 05, 2018 12:49 am

The SMAKN USB Isolator resolved my CV noise problem. Thanks very much

Incidentally I now have the QuNexus setup in the Logic environment such that anything sent to port 2 (midi) is also sent to port 1 (LEDs) and port 3 (CV). This allows one midi track to contain the notes, expression (mod, velocity, etc), and also light up the keyboard as intended.

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