A compressor comprising: a first scroll including a first end plate and a first spiral wrap extending from the first end plate; a second scroll including a second end plate and a second spiral wrap extending from the second end plate, the first and second spiral wraps meshing with each other and forming a plurality of compression pockets therebetween, wherein the compression pockets include a suction-pressure compression pocket, a discharge-pressure compression pocket at a higher pressure than the suction-pressure compression pocket, and a plurality of intermediate-pressure compression pockets at respective pressures between the pressures of the suction and discharge compression pockets, wherein the second end plate includes an outer port and an inner port, wherein the outer port is disposed radially outward relative to the inner port, wherein the outer port is open to a first one of the intermediate-pressure compression pockets, and wherein the inner port is open to a second one of the intermediate-pressure compression pockets; a capacity modulation assembly; an axial biasing chamber disposed axially between the second end plate and a component, wherein the component partially defines the axial biasing chamber, and wherein working fluid disposed within the axial biasing chamber axially biases the second scroll toward the first scroll; characterised by: a first valve movable between a first position allowing fluid communication between the inner port and the axial biasing chamber and a second position preventing fluid communication between the inner port and the axial biasing chamber; and a second valve movable between a first position allowing fluid communication between the outer port and the axial biasing chamber and a second position preventing fluid communication between the outer port and the axial biasing chamber. a first scroll including a first end plate and a first spiral wrap extending from the first end plate; a second scroll including a second end plate and a second spiral wrap extending from the second end plate, the first and second spiral wraps meshing with each other and forming a plurality of compression pockets therebetween, wherein the compression pockets include a suction-pressure compression pocket, a discharge-pressure compression pocket at a higher pressure than the suction-pressure compression pocket, and a plurality of intermediate-pressure compression pockets at respective pressures between the pressures of the suction and discharge compression pockets, wherein the second end plate includes an outer port and an inner port, wherein the outer port is disposed radially outward relative to the inner port, wherein the outer port is open to a first one of the intermediate-pressure compression pockets, and wherein the inner port is open to a second one of the intermediate-pressure compression pockets; a capacity modulation assembly; an axial biasing chamber disposed axially between the second end plate and a component, wherein the component partially defines the axial biasing chamber, and wherein working fluid disposed within the axial biasing chamber axially biases the second scroll toward the first scroll; characterised by: a first valve movable between a first position allowing fluid communication between the inner port and the axial biasing chamber and a second position preventing fluid communication between the inner port and the axial biasing chamber; and a second valve movable between a first position allowing fluid communication between the outer port and the axial biasing chamber and a second position preventing fluid communication between the outer port and the axial biasing chamber. a first valve movable between a first position allowing fluid communication between the inner port and the axial biasing chamber and a second position preventing fluid communication between the inner port and the axial biasing chamber; and a second valve movable between a first position allowing fluid communication between the outer port and the axial biasing chamber and a second position preventing fluid communication between the outer port and the axial biasing chamber.