Hi Zuki,
Still think you should record directly from your keyboard to the computer, thereby eliminating the headaches and expense of placing a recorder between the two devices. Give it a try and I sincerely believe that you'll achieve great results.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)