Can the amount of paint from the inner fed paint roller be controlled, if so from where?

Thank you for reaching out to us. The amount of paint can be control at the handle with a yellow button. You will need to press and release the handle button until paint appears through the roller cover. Start painting as normal, pressing and releasing the button as more paint is needed. Be careful not to over saturate the roller cover as it may drip or spatter. Please give our technical support a call at 1-800-328-8251 if you need further assistance.