i wonder if the octatrack is not providing enough power down the midi line?

that is the case with the machinedrums and the midi solutions quad according to their list of machines which do not work in the faq
http://www.midisolutions.com/faqs.htm#Power

you may need to purchase the power adapter in order to have it provide proper power for it to work
http://www.midisolutions.com/prodpwr.htm

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