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Question for Arturia MicroBrute owners
I know this is an AudioBus forum primarily, but I had a hardware question relating to AudioBus recording and didn't know where else to ask - I know a lot of people either own the Arturia MicroBrute or know a heck a lot more about analog synths than me.
I bought a used MicroBrute at Guitar Center for $199. It was in excellent physical shape, and I thought it was an amazing value as my first foray into hardware synths.
But listen to the 4 second clip in the SoundCloud link below. There are two bass notes I was recording to mess around with, but hear that sweeping noise in the background? What is that? It's this constant oscillation (almost like a filter or flanger sweep) faintly in the background. At first I thought I was just dumb about analog synths and there was some LFO setting or something I was doing wrong. But since the noise is always present, i'm wondering if it's a defect with the unit. I set all the knobs to a preset "init" patch per manual instructions but that background stuff is always there (worse if you turn it up).
Thanks so much for your help. I should look to see if there's a factory reset or something with the software that could address it. Otherwise, I may need to avail myself of their 30-day return policy.
Comments
Is this from the headphone or line out?
there is some oscillator bleeding through - sounds like a defect.
Maybe try to switch VCA trigger mode between Gate and Envelope several times. Or try the headphone out. Generally move all pots and faders several times, then test again.
Just sounds like a mains power issue... Move the keyboard away from screens or amps or stuff that could cause bleed... If you have an isolated power supply try plugging into that... I doubt there is a problem with the keyboard... Amps and guitar pedals do the same thing when they pick up interference from tvs or radios or bad wiring...
So, I initally heard it when I plugged headphones (Sennheiser HD280's) directly into the MicroBrute. It's actually easier to hear with headphones because it isolates the sound.
@ghostly606 - the recording above was the 1/4" line out to an Apogee JAM, into the data port of my iPad. So I think I've heard it through both the line out and headphone ports.
Will try some of the other suggestions as well...
is the Brute connected via USB to anything?
if so this could be a grounding issue that is common on all the Brutes I have tried.
possible solution : http://forum.moogmusic.com/viewtopic.php?f=11&t=15694
ground loops (especially with USB) and interference can be a problem, but in this case it sounds more like an oscillator bleeding through the last stage, the VCA. Maybe the suboscillator.
To test this simply change the pitch, and the background noise should change pitch as well.
I think this is it. There is a "fine tune" knob on top of the device - it can actually change the pitch by several semitones. When I manipulate that, you can clearly hear the oscillator noise changing in pitch.
So if that's the case, that's a defect, right? And one for which I assume there is nothing I can reasonably do to fix it? Looking like I may need to take this back. Bummer too, as I was just starting to appreciate how to work with it. (Though part of me wonders if I would be better off with a Volca or other polyphonic synth as a first or "only" synth)
the Microbrute (and perhaps other Arturia synths) appears to have a rather weak (unprotected) output stage that can be blown/melted in certain situations. Not sure if this is the case with yours, but you probably have to return it anyway.
To mass-produce analogue circuitry for affordable prices can have its disadvantages. Difficult or impossible to repair. It's a good idea to test such devices on the spot before buying.
Thanks for all your help. I doubt I would have heard it even had I tested it with monitors in a store. It's subtle until you listen with headphones or try to record it, but is actually a bit of a nuisance. I verified their 30-day return policy and will try to take advantage of that.
It's a pretty impressive sounding piece of hardware (well, minus this glitch) for $279 street price. I'd consider buying a new one to replace this one, but maybe I should look for something more versatile.
Way to go thread. Sorry for the trouble but glad it got sorted. You might be able to walk out with a new one. One benefit of big box shopping.