When setting a modulation value in the matrix, there is no real zero, but in stead 2 'zero' values: -00 and +00 which are actual different values (can be heard when applying extreme modulation input).
Of course a zero would not be absolutely necessary - you can just switch of the modulation switch - but other then a true zero you would expect the first + or - value to be +01 and -01, not +00 and -00. When programming you need a value between -01 an +01 but this should be (just) 00.
Similar occurs with value of M1 - M4 Macro Knobs. Here it's a little different; since these buttons are continues there are more then 200 distinguishable values, while the display represents only 200 values (-99 to +99), but also here it's strange to see (and hear) different values for -00 and +00
It's probably a small 'error' that slipped in the early concept, and maybe hard to change now since it would affect already created presets.
I would appreciate however if in future release or instruments there would be only 1 zero value, this would make more sense.
(just a small thing; meanwhile I'm having a lot of fun with this great machine)