Help finding 4 channel audio software

i have some old speakers that connect via 3.5mm to my laptop, and they work, one left and one right. but then my laptop speakers are off. i want to use laptop speakers as front right/left and the old external speakers for back left/right. i'm on fedora rn, but might switch. any software to achive this?

bonus for letting me fine tune the audio channels on each speaker in case i cant set them up symetrically or whatever..

edit: ive managed to unmute the laptop speakers via alsamixer, so 4 are playing at once, but its still stereo only