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when cutting a vinyl, if you have out of phase stuff going on in the bass (generally under approximately 200 hz) the grooves are going to be cut in such a way that when played back, the needle will literally jump out of the groove and this is a BAD thing.
soo... the whole thing about mono bass doesnt mean your actually bass patch should be totally mono.. it just means when you are making something and it is going to be considered to but pressed to vinyl, great care should be taken to make sure the sub bass frequencies are not going out of phase (meaning that they should stick very much to being MONO, but they can be a little bit stereo)...
what this means is... for your bass sound, the higher frequencies can have all sorts of stereo effects on them (chorus, reverb, delay, etc.), you just have to keep a check on those sub frequencies .
there are useful phase analysis tools that will show you a graph of the phase vs. frequency and analyzing the audio with a tool such as that is a good way to see if you have too much out of phase sub bass 
hope that helps,
-rob
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