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Mine arrived today - which is nice... Except for a medium-high pitch background hum.

It's quiet but noticeable, and is not affected by any parameter, including master volume. It oscillates fairly quickly and sounds like a noise a motor would make.

Do 'they all do this' or do I have a duff unit?

Any thoughts from other Volca FM owners?

Thanks, SS

the volca fm seems somewhat noisy in comparison to the reface dx and even the dx7

Noise a motor makes?
Doesnt sound good.
My Vkeys doesnt have such levels of noise.
Are you sure you are not inspecting microscopic noise levels with high amp volumes, that dont really effect everyday use.
I would travel to a seller to test one out if unsure.

Are you running it with batteries? That's the powering option that is the quietest AFAIK.

Interesting tsutek .My Vkeys is on batteries.

Same here...

The Volca FM arrived today. I noticed the background noise right after I turned it on. The pitch is 'b' and it moves with amplitude modulation (like a fast tremolo).

I am thinking about returning it.

Is this with the speaker or on the headphone out?

And I suppose any hum affected by the LFO is from earlier in the signal path.

Headphone out.

If the speaker doesn't have the problem, that's good news. The problem is somewhere at the end. If it persists when you use batteries, it's not a grounding problem, and you probably have tried different headphones, but-
maybe the noise is only on the left or right channel? In that case use one side of a stereo cable

No, I don't think so. I think it is kind of sloppy engineering and construction also given to the fact that this unit is so small that there is probably some interference going on. Maybe some cables are too close to others.

I know this from for example the DX 100 or the CZ-101, which both had a very noisy headphone output, but different to the Volcas they had proper line outs which were clean, so you could work on sounds with the headphones and when it came to recording you just change to line out.

And I had some extra noise coming from a Microbrute. I just had to open the unit and shift one of the cables a bit and it was gone.

The noise is on both channels. Headphones don't matter. I also hear it if it's plugged into an RME fireface. The Volca is on batteries...

Couldn't you tap the speaker output and make it into a line signal?

my volca fm is by far the most quiet of all my volcas. you might try to send it back.

also consider your interface. If it's a USB powered interface I'd bet your left nut that is the issue. I am dealing with it too.

Nope. It is firewire powered.

Mjustind77 - you just bet someone else's left nut haha.
Sorry ,back on topic- I use a mixer as my preamp or all hardware.
I have found computer audio interfaces to generate noise very often ,FWIW . Arh,but you said headphones too. Sorry ignore me,thinking out loud.
Maybe return if possible.