Adding to Kraivuth's advise...

The low 'up' setting applies mainly to the lower 15-20% of the RPM spectrum, depending on where the ramp switch is positioned (usually a hidden variable unless you've got a really old software version). The mid level ramp switch is loosely bounded by the 20-80% portion of the curve, based on where the 2nd ramp switch point is. If you judge your motor to be having trouble at a specific RPM, this info should help you to know what ramping value to adjust in troubleshooting the disgruntled turbine...

The larger the number of an up / down ramp setting, the longer the turbine will take to spool up / down through that RPM spectrum.

Kelly