[sdiy] USB/MIDI ground isolation?

[cheater cheater]

I bet the OP has a blofeld

D.

On Thu, Sep 17, 2009 at 9:01 PM, Neil Johnson
<neil.johnson97 at ntlworld.com> wrote:
> Hi,
>
> Manuel Odendahl wrote:
>> Am I missing something here?
>
> Yes, you didn't quote the right part.  Here:
>
>>  That doesn't apply to devices that don't have 5 pin DIN MIDI connectors; for
> example,
>> a synth with a USB/MIDI connector instead if a 5 pin DIN MIDI In connector.
>
> So, the question is about synth boxes that have a USB connection to a PC rather than a MIDI connection and pretend to be a MIDI device, for example one of those Roland Sound Canvas boxes.  In these low-cost consumer models I think it highly likely that the PC ground, via USB, finds its way to the audio out jack, leading to ground loops and a strong likelihood of hum.
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
>
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