Where it says 1&2, it should really say 2&3.
Where it says 2&3, it should really say 4&5.
And 3&4, the last slider, should really be called 6&7.
I should actually file a bug report about this.
What they do is to control the shuffle between a pair of steps in the sequencer. This is why I believe they are mislabeled. What's more, Renoise's groove function can only affect the odd (i.e. second) step of the selected pair by delaying it. You can't do inverse shuffle like in LSDj, where the second step is played earlier than it normally would have been. Also, this means that you can't do shuffle over multiple steps, say you have notes on steps 0, 2, 4 and 6. No way to do it using the groove function, whereas LSDj could do it with something like a 7/7, 5/5 groove or whatever. (See my article on ticks and grooves in LSDj) Or put differently, Renoise can only swing 16th notes or whatever your LPB setting dictates that the smallest interval is.
What this translates to is that an LSDj groove can be translated to a Renoise groove if...
1) the LSDj groove has multiple pairs, each step must be equally long if you want to be able to to translate it precisely. 7/7, 5/5 (used for 1/8 note swing) wouldn't work since one pair is 14 ticks long and the other is 10 ticks long.
2) the LSDj swing value is >=50%.
If those conditions are true, you can take the percentage in LSDj and calculate the corresponding Renoise groove with the formula Renoise_groove=(LSDj_groove-50)*2. In other words, you take the 50%-100% range and scale it to the full 0%-100% range, if that makes sense.
LSDj's grooves are variable length, but Renoise has a fixed length of 4 groove patterns, or 8 sequencer steps, so if your LSDj groove is only two steps, you need to repeat it across all 4 sliders. By default, the groove presets will contain progressive settings for all the 4 sliders. 1=all 0%, 6=all 50% and 10=all 90%.
So for example, to convert the simple LSDj groove 8/4, you first look what the percentage in LSDj is, which is 66%. 66-50=16; 2*16=32. So you need to change all of Renoise's sliders to 32%. You might that 30% is close enough and just click the default preset 4.
Hope I made sense for once. 