Configuring sgminer to use multiple GPUs?

This should have a simple answer but my duckduckgo searches have not been very fruitful. I’m trying to mine with both an RX 570 and 560 on the same system, but since adding the 560 sgminer only detects and uses that card. Kinda blows my mind how the answer is not the top result of a search? But here I am. Any grief will be ignored, if you’re mad about GPU prices you should work some more and game less. Anyway, my config is as follows:

setx GPU_FORCE_64BIT_PTR 0

setx GPU_MAX_HEAP_SIZE 100

setx GPU_USE_SYNC_OBJECTS 1

setx GPU_MAX_ALLOC_PERCENT 100

setx GPU_SINGLE_ALLOC_PERCENT 100

sgminer -k myriad-groestl -o stratum+tcp://xvg-mine.idcray.com:10061 -u username -p password -I 20

pause