Piano_Addict's Casino inspired by StupidFatHobbit
To reduce desired quality of final product, change the 2 inserters pulling out of the machine.
Disabling higher quality is more complex, need to edit the decider combinator. Delete the AND groups for the quality. Switch to buffer chests, disable requests and change inserters to recycle higher quality. Don't request lower quality ingredients from buffer!
Additional comments in combinators