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I have an Alesis DM Lite e-drum kit , an Alesis SamplePad , a Roland UM-ONE mk2 MIDI-to-USB convertor , a Montarbo Eve 5 mixer and a MacBook Pro.

Sometimes I use the audio output from both drums (and Songsterr from an iPhone) into an external mixer and noticed that the SamplePad randomly resets itself every 15 minutes or so.

Sometimes I do not use the audio out from drums into the mixer but plug in the USB MIDI outputs into a MacBook Pro and use the oudio out from there. Noticed that the SamplePad does not reset itself.

I stopped using the audio output into the mixer configuration because I'd like to not destroy the equipment.Attached a rough schematics of the complete setup.

Any clues why the SamplePad resets itself ?

Is it a possible "ground loop" ? The power supplies of both Alesis drums are "wall wart" style, without ground on the plug. Both are mounted using plastic pads, so there is no common ground.

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  • latest drivers?, faulty cable, grounding issues (you can get a little tingle from macbook pro cases), audio problem with mac osx (Can it handle 3 soundcards), is it trying to draw power from USB (try a powered hub), do you have your master clock set and everything else as slave – Dave Engineer Mar 31 '15 at 9:10
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I added ground cables between the Alesis drum brains and the mixer. So far, no more resets.

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