sometimes it's just screws on the internal power supply that s a bit unscrew, you can check this first... if it's something else i don't know ;... of course unplug the machine to operate !
> Subject: Alesis multimix line 8 Transformer question
> From: firstname.lastname@example.org
> Date: Wed, 26 Aug 2015 21:02:51 +0200
> To: Loopers-Delight@loopers-delight.com
> Hi folks,
> I recently bought a new alesis line 8 multimix rack mixer from the U.S.
> In the back there is a voltage switch which i change before using here from 115 to 230v
> I plugged it in here in germany but the whole chasis vibrates and it hums quite loud
> Any ideas?