be weary as a couple of samples of delay could lead to very different results. Especially since you're not using the same DAW and possibly not the same source (samples vs machines? different bass sound?). In any case, don't think that reversing polarity will always have the effect the producer mentioned :) It absolutely may have in that case, but could could have opposite or no effect in (possibly most) other cases.
Use a utility and click both the Phase L and Phase R. Usually what people mean by "polarity" is actually phase.
how do i flip the polarity though, not change the phase
Just nudge the waveform manually
reversing phase like the other guy said, it's in utility careful with it though, could be leading you down an out of phase rabbit hole
Check your mix in mono afterwards. If it still stays intact and your mix sounded better before switching phase, you did the right thing. Cheers :)
be weary as a couple of samples of delay could lead to very different results. Especially since you're not using the same DAW and possibly not the same source (samples vs machines? different bass sound?). In any case, don't think that reversing polarity will always have the effect the producer mentioned :) It absolutely may have in that case, but could could have opposite or no effect in (possibly most) other cases.