I assume this is in relation to your recent purchase of Piezo Pro inks. The instructions are really only referring to channels rather than inks. On some older printers (R2400, 3800) the channels are termed M and LM, whereas on later printers (R2880, R3000, 3880) they are labelled VM & VLM because Epson 'improved' magenta by making it more vivid. This distinction is of no consequence for Piezo users, you can ignore the V and just focus on the M and LM as channel designators for ink placement.