4.2.2 Audible High Pitched Noise in Computer Audio When Using CV
Some may experience a high pitched frequency when using QuNexus with a laptop while
connected to CV synths.
Causes:
It is possible that noise from the QuNexus LEDs can bleed into the power supply of the laptop,
which might cause audible interference when mixing audio from the laptop with external synths.
This can vary by computer and synth.
Solution:
Currently, there are three approaches to resolve this problem:
1.
Power the QuNexus through the Expander Port instead of through the computer and use
an external audio interface. If possible, power the audio interface from a wall wart.
2.
Also try changing the LED Refresh mode options in the Hardware menu of the QuNexus
Editor. Try Control Only first and see if that helps. Setting the LED Refresh Mode to
Control Only means that the keyboard lights won't light up; only the side buttons will light
up. LED feedback will behave normally in the Preset Select and Live Edit Modes. If the
hum persists, try the "All Off" setting. The "All Off" setting disables any LED feedback on
QuNexus.
3.
Make sure to have a hot/loud signal coming out of the laptop so you don't have to put a
lot of gain on it, and then if you need to you can reduce the signal later. The best use-
case would be to run your audio into a mixer so you have more control over it. Using an
external audio interface that has its own power will also help.
4.2.3 QuNexus LEDs Light Up Erratically When Receiving CV Input
You’ve set up your QuNexus to receive CV from a synth through the CV Input port. You’re all
ready to go so you try it out and suddenly the LEDs of the QuNexus begin to flash strangely and
you’re not sure why.
Causes:
QuNexus' CV Input is uni-polar and is meant for a signal up to 5 Volts. If you send it a bi-polar
signal or a signal above 5 Volts, the signal will be clipped and can cause malfunctions in
extreme cases. One way these malfunctions can manifest would appear to be erratic LED
behavior. Don’t worry, nothing is damaging your QuNexus. What is happening is the QuNexus is
going in and out of Preset Select Mode and Live Edit Mode. The details of why QuNexus
malfunctions this particular way aren’t important -- just know that your QuNexus is not being
harmed, it just isn’t meant to receive bi-polar CV or signals above 5 Volts.
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