I use Logic X and have had this interface for a few months.  All of a sudden when I was trying to record some tracks, I was getting a digital frequency ringing that comes and goes as I test my input levels.  I have switched usb cords, I have made sure there are no other wires touching the interface.  I have tried switching out XLR and quarter inch input cables and they still give me this weird intermittent frequency buzzing sound.  When I try and record in Logic the buzzing sound was actually recorded and you can see the wave form of the noise.  Does this sound like an internal hardware malfunction in the interface?  Thanks for any help in advance.    

 I attached an audio sample of my snare drum but you will hear the high pitch frequency interfering with the track.   

*Warning- very noisey so listen with low volume

My Neutron is behaving quite strangely. When I plug something in to the Att2 Out it changes the sound quite a bit. It's like it's changing the Pulse Width. If I then connect the same or a different patchcable to the Att1 In it changes even more. It's like it turns down the PW2 from 2 o clock to 8 o clock.

I can turn it by hand, but it seems like unintentional behavior and sometimes it changes my sound quite drastically and when you have a complicated patch it can be quite tricky to find out why your synth is suddenly making almost no sound even though you just routed something to the Attenuators that are turned all the way down. You would expect to change at all untill you start turning the Attenuators.

I added a video to demonstrate what's happening/ I would really appreciate it if somebody that owns a Neutron can try doing what I did here and let me know if this is how they all are of mine is somehow malfunctioning.

I just updated from Firmware 1.0 to 2.02 and it didn't change anything by the way.

This pedal just rocks! But nothing is perfect. It has in two disadvantages for some:

- huge
- no battery compartment

The input stage has a noise gate, where you can set the threshold but not the decay. Not perfect but comes in quite handy.

You have two knobs for gain and master. The master volume works in a very clean way. The gain knob gives you the gain of a tube stage. From a tiny bit of crunch, a little more saturation to full distortion is there everything.

The tone control consists of three knobs. Some folks hear some mid scooping, but I don't. You can easily take treble and bass down, if you want even more mids.

The build quality is very decent. It has a sturdy metal case and the potis feel smooth.

Best of all the flexibility of the sound. You can use them as booster to drive a tube amp into saturation or dial the tone of it's own real tubestage. And everything in between.

And you can change the tube. I fine with mine, but you can find on youtube folks changing the tubes, getting something really impressive:

I got that Behringer SF300 fuzz pedal for a bass in combination with an octaver.

This fuzz just does the job. I would have loved an additional blend knob, but the original Boss FZ-2 did not have one so the SF300 does not have one either.

Steve Reis from "Does It Doom?" compared here both pedals and they are damn close:
This is a very nice pedal, but it has (as the original) no subtlety. You can't dial in just a little bit effect, as you can do on some overdrives. When this thing is on, you get instant fuzz effect.