Originally Posted by Scott999
Now, since the 11 Jan update the "initial spool-up rate" function has been altered and cannot be slowed for "scale use" to any slower than 6 seconds within its total range of 0-20.
In testing my ICE75 I found that it wasn't that bad, but V4.02 definitely is not as slow as V3.27. With V3.27 I got an initial spool-up time of 19 seconds on rate 1, whereas with V40.2 it took 11 seconds (with either software version, using rate 0 did not slow it down any further).
I suspect that whatever change fixed your 'head speed change rate malfunction' problem has also affected the spool-up rate. Hopefully Castle's software engineers will sort this issue out soon, however in the mean time have you considered using simple governor mode instead, or even just using fixed endpoints with an appropriate throttle curve? Spool-up is much slower in these modes.