Roland R-70 For Sale. Nice assortment of sounds like those on the R8 mkII. Fully tested by professionals and working well. We did not get this unit with a power adapter and tested it using a universal adapter we use in our shop. Buyer must provide their own adapter (9vDC, negative tip, we would recommend 1 amp = 1000 mA to play it safe. Roland recommends a Roland ACB or Roland ACI adapter, though we're not sure how many milliamps those are).