If the LFO is bipolar and the destination is a list you are restricted to selecting values either side of the one initially set. Lets test this with another destination that has a list of values.
Grid machine.
Slices: 4
Selected slice: 3
Mod Destination: Slice Select
Mod Trig Mode: Hold
Mod Waveform: SQR
tapping the track button to fire a trig and sample from the current LFO position, lets see what that gives:
Mod Depth: 0.01-0.99 , selects either slice 2 or slice 3
Mod Depth: 1.00-1.99 , selects either slice 1 or slice 4
Lets see if it works the same way for play mode. keep everything else the same set MOD destination to play mode instead of slice select.
with FWD.L selected, and the depth of the LFO in the range of 0.01-1.00
tapping the track button to sample the current LFO selection always gives FWD
Interestingly this is also true if the depth is set to -0.01-1.00 Edit: that’s not interesting the LFO is bipolar,
Edit: setting the depth to 0.01 and the initial condition to REV cycles between REV and FWD
Conclusion. The way the slice select is setup as a modulation destination differs from how play mode is set up as a modulation destination.